Choices, Choices

Ok, I want to get a 125 2stroke Bike. I Am moving from a 2004 Kawaskai 250F which I am currently trying to sell. I am 16 I weigh about 165 Pounds and I am 5'11". I want the bike to be at least as fast, or close to as fast as the 250F. I don't race. I do 75% trails, 10% Steep Hill Climbing, and 15% Sand Dunes. I have never ridden a 2stroke dirt bike but I do have a banshee so I am not completely new to 2strokes. I have been riding ATV's and Dirt bikes for 4 years. I don't have a preference for brand, I just want whatever one is best. The thing that I think is most important is reliability, I don't want some bike that is going to overheat or breakdown on the trails. I will probably Get a new exhaust system, new air filter, re-jet it, and possibly get some nice reeds if I have the money. Is a 125 Two Stroke Race Bike, Even the right bike for what I want to do with it? One of the main reasons I am going to the 125 2stroke from the 250 4stroke is that the 125 is much lighter and alot easier to start up.

Which of these bikes would be better stock:
2001 KTM 125SX
2001 Honda CR125R
2002 Suzuki RM125
2004 Yamaha YZ125.
2003 Kawasaki KX125

Most Reliable Bike:
Fastest Bike:
Best Handling Bike:
Best Overall Bike:
Best Aftermarket Parts Selection:

Ok I edited the post and narrowed it down a bit.

Yeah, I have a 250 Four Stroke so I do know what you mean. But that bike is a big bike and I really like the size and weight of my 125 Four Stroke I just dont like the lack of power and crappy suspension it has.

Hmm, i have been reading a bit about the KDX200 and it looks like a good bike, is it any smaller or lighter than my 04 kx250f tho? Also I cant find any for sale used in california.