I am a newbie too on DSLR. I bought the K100DS slightly over 4 months ago and have no regrets
Prior to the purchase, I spent 3 months studying up on my options: Pentax vs N.... vs C...., etc. This is the community that convinced me it must be a Pentax. Because you are already here, trust me, you won't be making any grave mistakes. Just spend time reading through previous postings and make you choice.
I love this hobby and a great part of it derives from making decisions: on camera bodies, lenses, when to upgrade, when to sell, etc. The process is a never ending one. There's really no wrong decisions
Beware of LBA though. It's really contagious and you may have to put to practice lots of self-control. But then, it also contributes to lots of fun. Just enjoy it