I agree that some of our units are outdated/overpriced, but I still think there are several viable builds for Tyranids in 6th. I wouldn't think about psychic powers as being a "crutch", but as a strength of the Tyranids. I used to run triple power tervigons, but lately I have just been giving them catalyst because the FNP is so useful, and it frees up points elsewhere.
Here's a list I used at the LGS 1500 pt tourney this past weekend.:
Flyrant with 2 pairs of devourers, warlord
Flyrant with 2 pairs of devourers, hive commander
Tervigon, cluster spines, catalyst, toxin sacs, crushing claws
Tervigon, cluster spines, catalyst, toxin sacs
10 termagants
10 termagants
Carnifex with 2 pairs of devourers in mycetic spore
Carnifex with 2 pairs of devourers in mycetic spore
I expected the list to be fairly competitive, but it ended up being flat out nasty. I would fly my tyrants up a flank and drop my carnifexes near...everything in the area just died. I ended up tabling 2 of my opponents (DA, DE), and handily beating the third (Necron/Tau). Yes, there is some cookie-cutterness (is that a word) as far as troop choices go (usually 500 pts worth of termies/tervies), but you still have a lot of variability with the remainder of your points, even at 1500.