Mmmm.... Calzone golems....
The more I think about it, I have to agree with Thurbane, Kmart Kommando, and Dannyalcatraz. I'm not a big fan of psionics, steampunk (with an asterisk), metagame advantages, or one-shot kills (for either PC or NPC).
Metagame and one-shots I don't like mainly for mechanical reasons--they destroy the sense of fun for me. For me, the game is about overcoming challenges, and any challenge that can be instantly destroyed or instantly destroy others itself gets in the way (I don't typically have a lot of Raise Dead in my games).
Psionics and steampunk aren't so bad for me. For psionics, I just don't like what is essentially magic with a different system. Also, its poor implementation in previous editions tends to leave a bad taste in my mouth. I've just never grown familiar enough with the system for me to have the confidence to design an adventure around it or play a character with it. As for steampunk, it depends on how it's used. Heck, I have a kinda-steampunk campaign right now; the party just beat an artificial vampire involving alchemical processes and a boiler. However, I think I'm more "clockpunk" than "steampunk"; technology bordering on magic is made possible through incredible complexity, not through power storage. The steampunk I don't like is wild-and-wahoo steampunk--a lot of steampunk source material is more comedy than dramatic action. So I like it, kind of, but it's easy to get wrong, in my opinion.
These are just style considerations, though. Be upfront about what the campaign's about, and I'll play... So we're pilots of fantasy mecha controlled by psionics and using a Bribe-The-DM system for resolution? Cool.