Congrats! You picked a good one. I have two K-x bodies & they're the only DSLRs I shoot with. They're so good, I've never felt I'd gain much by upgrading.
Eneloops are the most recommended battery for them, but I use Energizer & Kodak rechargeables with good results. My charger is a
Maha MH-C801D. A bit spendy, but it doesn't ruin the batteries. Stay away from the 15 minute quick chargers. They're convenient, but they burn up the batteries quick.
I don't mind the absence of AF indicators in the viewfinder, since I set my AF point to center anyway... Just focus with the subject in the center, recompose & shoot. No biggie.
Going digital was the best thing I ever did as far as photography is concerned... I'm sure you'll dig that K-x!
Cheers,
Bob :-)