Cursed GBA! I was about to pull the trigger on a KX and talked myself out of it as it was too much like my K2. So instead of just quitting while ahead, I purchased an MX. While it is purported to be in very good condition, I suspect a visit to Eric is in its future. He has done a CLA on several of my film bodies and he is a craftsman!!
Anyhow -- you'll love the KX -- these bodies feel well engineered and are solid performers. Like my K2 (and it really is close) it will perform and feel fabulous with a nice K55/1.8 or K28/3.5 lens attached!!
Oh -- and get ready to add Eric to your address book as this will not be your only Pentax film camera.