I got the L-Trac with 2 external switch jacks in black with no led backlighting. This is the best trackball I've ever used. Besides the fact that I feel like I don't need to clean it as often as the other trackballs I've had, the ability to use a billiard ball is a fun little extra, and the possibility of wiring up your own buttons (instead of buying the ones that they offer) is also a fun little extra. The switch jacks are very useful even if you were to only use them as mouse 4 and 5 (which is what they are by default if I remember correctly) and the Superior-X software lets you customize them to pretty much anything you might need. If it can't be done in the software there is always AutoHotkey.
Unfortunately, this trackball did not provide me clearly superior color coordination.