There's lots of great info on www.4wdrc.com
as well - check it out.
I'm pretty biased (check the sig...) but I love the X - 5. Its a combination of the best of the Losi XXX4 (acceleration and ease of maintenance) and XX4 (amazing handling in the bumps and over jumps). Service and shipping are top notch as well.
Really, there are a host of great 4wd electric cars on the market right now. A quick list if you really want to shop around (I've tried to just kind of give the general consensus on each car below; to be fair and keep out my editorial comments. I'm sure some people might disagree with me, and they can certainly voice their opinion):
*BJ4 World's Edition: Carbon Fiber (CF) dual-deck chassis, shaft drive with the spur gear and motor in the middle, saddle pack at the rear.
*BJ4 (regular edition): not made anymore (I don't think?) but parts support is still great, you can find them around used, they have a dual deck CF chassis, shaft drive with the motor at the rear, side-by-side battery pack along the left.
From Team Losi:
*XX4 World's Edition: old car that's been re-released. Molded graphite chassis, 3 belt sealed driveline, mid-motor (and centered side to side), saddle pack at the rear.
*XXX4 Graphite+: molded graphite chassis, sealed single belt driveline that's incredibly quick in a strait line, side-by-side battery pack along the right side of the car, lower ground clearance than most other 4wheelers, some durability problems with out the right upgrades.
From X Factory:
*X - 5: molded graphite chassis, sealed single belt driveline, 4+2 battery pack split (two cells on motor side, 4 on the other), uses a lot of Losi XX4 suspension and chassis components. Requires modification of a few parts to put together.
*MR4-BX: CF dual deck chassis, twin belt driveline with open diffs, saddle pack at the rear of the car, mid-motor
*TRF 501X: CF dual deck chassis, twin belt driveline with open diffs, saddle pack at the rear, mid-motor
*Dark Impact: molded plastic chassis, centered motor and stick pack, shaft drive, cheaper car
*Lazer ZX-5: molded graphite dual deck chassis, shaft drive, motor at the rear, side-by-side battery pack along the left side, cheaper car but needs a few upgrades to be durable
From Hot Bodies:
*Cyclone D4: not released yet (I think sometime in April?), CF dual deck chassis, shaft drive with spur gear and motor in the middle, saddle pack at the rear
*SB Pro V2: just released, CF dual deck chassis, motor/spur gear at the back, lots of battery arrangements possible, cheaper car. The SB V1 was a good entry-level car that took quite a bit of work to make into a competitive track car; the V2 was supposed to fix those flaws. We'll see as people begin to run them more).
You can find a whole lot of very in-depth and thorough reviews of a lot of these cars at the English website, www.oople.com