Probably not telling you anything new but....
First off, buy a decent rod which will start off at around 100 dollars. Stay away from the big store combos where you can get the rod and reel for 100 dollars. All of the rods mentioned so far, like the Shimano Convergence, Fenwick HMX, Trophy XL are all decent rods. I've got a Trohpy myself and it's fine. I recall that Shimano is now offering a "lifetime limited" warranty. In other words, if you don't abuse the rod, it should last you a lifetime.
Now - a bit of a higher end rod will be around 250 - 300 dollars. These will be your G Loomis and Lamiglas rods (for example). I have a Looms GL2 STR 1264 and its a fine rod. I think it retails for around 275 - 300 dollars. You'll get a warranty with it, which some guys have mentioned already. These rods will be nicer to cast and hold all day long.
I recently picked up a Sage 2106 and it rocks! Has my catch increaed? No. I can catch just as many fish with the Trophy. However, the Sage is much more enjoyable to use all day long. It's finished beautifully, and it's very sensitive. Plus, it's a factory rod so if it breaks, it gets replaced without me having get it rebuilt. I think the Loomis GL3 rods will be simliar in performance and quality. I haven't tried a Rainshadow, but you already know the risk of getting a custom rod (if it breaks).
I guess I'm recommending to go with what works best for you. I don't think you can go wrong either way. If you're looking for a higher end rod, the benefits will be there - maybe not in catch rates but in pure enjoyment.