I have Thomsons on most my race bikes. Best stem for the money, IMO; fairly light and very stiff. They come in a large variety of lengths and angles as well, which is important to me.
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter