The GG is said to turn better and have a smoother powerband than the KTM, Im not here to flame the 'Toomer it is a great bike. Of the three 200's available the GG is the most intriguing. The KTM and the GG come with the same fork but the GG has better control, they use different rear ends, the GG is more like the Kawasaki, infact the frame is also like a KX, the KTM still has a few problems with there rear suspension to work out. The KDX on the other hand is really only hampered by the handling, somewhat heavier feel, I dont really buy into the fact that the suspension is junk and that you cant win a race on it, not that long ago everyone was jumping on the conventional fork bandwagon, the fork that came on the RMX (1995-96, was a 45 mm conventional fork, and all the KTM's were using 45mm 'zokes, including the GsGs) were and still are great off-road forks. If the KDX didnt hang down so far and maybe 2mm larger they would be awsome. The motor came be modified to compete with the other 200's, sure its abit down on power, but you can still run with other riders on the other bikes, you just need to learn how to ride the bike. It is much cheaper, parts are much easier to find new or used. It really depends on your budget, I would really like to try the GasGas 200, a rider in the club races one here in the desert for Motowest and has the number 1 plate on his bike in the 1-200cc expert class, though last week he broke his frame:scream:
BTW, you can still order the GG with a set of Ohlins conventional forks, there most exspensive bike comes with an all Ohlins suspension. It is a tough call, a good cheap bike that needs some modifications, or a highend woodsracer that will still need a few goodies to make to your likeing.