I recently edit this thread to add the Mr2 with eye, and to fix the pictures. I'm right now working to add the RS series, and the classic series, with the new pilot and electra.
RS Series
RS:

Same body as VS2 and VS3, but this don't have the balanced valve, so it can be use with Co2. And it's all compatible with the VS body kits. CO2 compatible hybrid using SE technology (low pressure and dual air source), lower pressure than regular blowbacks, but still compatible with CO2. This is to me what the VS1 should have been.
RSX:

IMHO, this is the very best blowback marker ever done. It combines every big technologies available at this time. It have the same specs as the VS2, 3G balanced valve and infitinty trigger, plus it adds the Tadao board, with 5 Modes of Operation (Semi-Auto "Uncapped", Semi-Auto, PSP, Millennium Ramp & Burst "15 BPS Cap"). The reg is now separated from the ASA, and is in the foregrip. I never seen a better blowback marker on the market, never. If you can find one for cheap, go for it.
Classic series
Pilot '09 with eyes:

In 2008, Kingman made great efforts to reduce overall weight and size of their markers. The Pilot is the result of this work. It's 25% Lighter and 15% Shorter than it's been before. It also some with a the new LEAP board, developped by Tadao. It's a kinda entry version to the tadao board, and gives 3 Modes of Operation (Semi-Auto, Ramp PSP, & Ramp Millennium), and support regular 9V batteries for the first time. The barrel lenght is 11", and the board is capped to 25 bps. The 09 version add a Clamping Collar Feedneck.
Electra '09 with eyes:

This one would be my choice if I had to buy a new spyder today. It have the sames spec than the Pilot, but with a nicer design, and the SE technology, indroduced with the spyder RS. That means it can be used with Co2 and HPA, at lower pressure than regular blowback markers (300PSI). Also comes with the clamping collar feedneck, and with the LEAP board.
Victor '09:

Reduced Overall Profile (15% Lighter and 10% Shorter), this mech spyder also add a new clamping collar feedneck. It's also tool free for easy field strip and maintain, which is really for new players.
Sonix '09:

Same body than the Victor, it simply adds a foregrip, to get more comfy.
Xtra '09:

This marker is just as legendary as the Tippmann 98c for his reliability, and is much more easy to clean and use. It adds the sames specs as the sonix and victor, but adds an expansion chamber to help Co2 to expand, and prevent liquid Co2 to get inside the marker.
And that's everything I got right now, hope this will answer alot questions you may have !