Just make a nandroid backup & flash the stock rooted rom. After activation you can just restore from your nandroid backup or flash another rom.
I'd suggest the odexed version of stock. If you're taking it in, go ahead and flash the latest update that came out yesterday so they don't try to update it for you.
Hboot 2.02 S-Off
Amon Ra recovery
More stuff that I'm too lazy to figure out and type.
MIUI 2.3.2_b1 ES (by Swiperat)
Extended Settings Mod
Tiamat 4.1.0 SBC
My wallpaper collection
If you think I can help you with something or need me to elaborate on a post then feel free to pm me. I'll try my best to help you out.
Oh, and I have a vagina. Fear me :P