pondering the same question . . .
I've just about given up on getting a carbon bar ($$). If I did go that route, would probably get the Kestrel KMS Pro on Ebay ($130 shipped), since it seems solid, relatively cheap, highly reviewed, and can take clip on aero bars (for triathalons).
I'll probably go aluminum instead. Nashbar has an oversized Nashbar-brand bar (44 cm) for $25 or so.
As for stem, I'm a bit more confused. I'm read good things about the Deda Newton, which Competitive Cyclist has on sale for $90 (still pricey).
http://www.competitivecyclist.com/z..._STANDARD&PRODUCT.ID=369&CATEGORY.ID=38&MODE= Mixed reviews, but the negative votes all have to do with spripped threads--not about flex, lack of stiffness, etc. I kinda wonder, though, if the fact that this is listed as a 31.7mm clamp size (vs. 31.8mm) may affect the amount of thread that the bolts enage in the socket when used with a 31.8mm bar.
I like competitive cyclists selection of stems, and their descriptions. They have two Thompson road stems, too.
Nashbar has the Ritchey WCS oversized stem on sale, but lot of reviews say this is too flexy for Clydes. The Ritchey Pro is cheaper, a bit heavier, and supposedly stronger:
I'm still firmly on the fence. I'm not even sure what angle stem to choose (86, 84, 83, 80, or even less degrees?). Sheesh.
Maybe I'll give the Nashbar carbon a try. Its heavy (150gms), but on the cheap side, and may soak up some more of those bumps for use with my cheap aluminum bars.
http://www.nashbar.com/profile.cfm?...and=&sku=14123&storetype=&estoreid=&pagename=
Good luck, and let us know your results.