Best 1x123 SSC/Cree for Keychain?

I am looking for a light to replace my Inova X5 which is currently on my keys. I want it to be: 1xR123 preferably so it can be rechargeable as well as not. Cree, SSC, K2, etc... or similar brightness LED, preferably multi-level to conserve power/emergency-minded, decent way to attach to keys(some of the holes I've seen have barely enough outer wall to hold a split ring for a week before rubbing through.). It has to be TOUGH AS NAILS. It will get beat on and knocked about. I am open to any and all suggestions, but I prefer quality over price. I thought of Fenix first, but I don't know how well they would hold up to this task. (I actually considered putting my HDS EDC U60GT on my keyring...) Please help me to choose another awesome light!!!!

For tough as nails you cant beat stainless steel. i`ve had a ultrafire c1 on my keyring for just over 6 months and it`s been used every single day, dropped on concrete, thrown in my toolbox, fell out my shorts pocket on a motorcycle, thrown at a brick wall after an argument, and played with by my cat and it has never suffered any marks or damage. for $29 + $10 for a cree Q5 and $3.16 for a 1000mah 5 mode regulator with mode memory i can honestly say it`s the only light i would want on my keyring. if there was only one thing i`d change is i`d change it would be i`d swap the sos mode for a lower low. the other thing to bear in mind is with the standard driver it can run with primarys but with the 5 mode it`s li-ions only or very dim with primarys. very good runtime on low with li-ion though. very smooth beam with no rings thanks to it`s aluminium OP reflector and mineral glass lens and it has o rings. use a corn plaster at the end of the tube to prevent battery rattle when off with some batteries, and to make the most of the 5 mode board i found it adventageous to swap the o ring on the LE to battery tube to a slightly thinner one to make swithching modes a touch easier. threads on mine are perfect.
http://www.dealextreme.com/details.dx/sku.3249

Hyperion CE might also be good if you can find one.

I agree that the Ultrafire C1 looks great.