Suzuki SP 125 Help please

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7903186118&category=35599 is the bike i just bought...

I payed 175$ good deal or no?

Somone ran engine w/out oil. .
Anyone know what needs to be done as far as rebuilding it...?
I haven`t seen any posts with sp 125`s whys that?
What engine parts fromn other bikes will fit this engine?

I`m sure change camshaft bearing if there are any I work on cars not bikes so i don`t know. new piston maybe, or honed cylinder walls and a ring kit. Maybe an overbore and new piston, What else will need to be changed, i heard the tranny is in good shape...

How far can i bore? will i need to port out the head to match the bore?

Please be through :-D any help is appreciated. I don`t have the bike yet so when i get it, i`ll asses the damage.