Well, I'll answer all your questions.

Here some basic principles:

Heavier means more stable. It is harder to swing. It cuts top spin and power, but offer control.

A denser strining pattern means lesser deflection, thus more control, but lesser power and spin.

A longer racket is harder to control, but offer more power and spin.

Spin and power are about swinging speed, control is about stability. This is how you conclude what gives what.

FIRST, THE RACQUETS

AeroPro Drive Cortex
H size 100sq. in.
Strung weight 10.6oz/300grams
Length 27''
Stringing pattern: 16X19

PureDrive GT Roddick
H size 100sq. in.
Strung weight 11.1oz/315grams
Length 27''
Stringing pattern: 16X19

Well, they are pretty similar raquets. But, the frame composition isn't the same. AeroPro is made of 100%high modulus graphite while PureDrive is made out of of tungsten and graphite... Roddick's PureDrive is made to feel more solid and allows greater power. Nadal's AeroPro is made to cut through air and allows greater spin.

Just watch who plays with it. Roddick has great spin, but he's mostly about power. If you are the guy who pocesses a HARD serve and look for power, it's better to go with it.

Nadal's aeropro is made to give you an advantage to brush up easier. If you play very high balls, it's quite better to go with this one.

Very very similar, it just depends on what do you mean by aggressive baseliner. They are both aggressive, although I'd Nadal is more percentage playing and defensive than Roddick.

He stands way behind the line, play very heavy spin. His game is to give a hard ball to hit and wait until a bad shot lands short on his side.

Roddick is more about out running his opponent. He bases his strategy on hitting hard and getting the point over as soon as possible.

NOW, A MOTION ANALYSIS

Most top players do not have a "conventionnal Windshield wiper", it's always a modified version to suit their need as players and body tendencies. Let's take the two extremes on the circuit.

Federer and Roddick.

Roddick swings what I qualify as being a conventional Windshield wiper. Bent elbow finishes very low, have a very upward swing path and he's got more spin the the average top player.

Federer is nearer a classical forehand. He's the world top freak with this impossible marriage of a windshield wiper motion and a classical forehand. His elbow isn't bent at all. His arm is straight, down, got a short take back. His swing path is still mostly upward, but it is more diagonal than Roddick's. Roddick, Nadal and most pros, brushes almost straight up, causing a very clear Windshield wiper finish. But Federer, ends up way higher, about at his shoulder. But, it hardly can be called a classical forehand for one reason: The strings are still, plus or less facing the opposite court side almost during all the swing.

A classical forehand would have a little more straight path, but would end up showing the egde of the fram rather than strings.

YOUR SWING

If it's effective and not injury prone, never causes any pain, you have a good forehand. From what I understand of your follow through, it's more like a Federer forehand than a Roddick's forehand, right?

It wouldn't affect your swing although the advantage of this shape is mostly to raise striaght, more like Nadal. It might not give the extra edga you hope for.

CONCLUSION
If I was you with enough money, I would seek for which pro has the most similar swing to mine. In your case, you might prefer to look for who has the same forehand and look through this brand which racket suits me best.

If you want to stick with Babolat, despite my explanation above, go with Roddick's PureDrive.

Of course, I would not advise you to pick Federer's K sixone tour since it is tremendously demanding and you need to be outrageously good for it to help your game. You need a very clean swing to use it since it is very heavy 355grams(12,5oz) and has a very small head size 90sq. in..

But, using a K factor myself, I can tell the difference their new matrix of Karophite black makes a difference in feel. If you need more control and as you describ yourself as an aggressive baseliner, think of Wilson's K factors.

Briefly, Karophite black is a Gaphite racket reenforced with SIO2 molecules bonded to it with carbon black. Harder, stiffer, more resistant, way better feel, way more control. They also have other engeneering inovations which provides incredible stability and thus incredible feel and control. Really worth trying.

Anyway, I'd check them as well as other and probably would ask to demo them if possible to see which gives me better feel.