buying rx8 and engine swaps

Alright guys new to the rx8 forums and don't know a whole lot about rotarys so your help is much appriciatted x) Looking to buy an rx8 and having "or doing if they're simple" a rebuild done. Id probably drive that for a couple months and eventually throw in a 2jz or maybe an sr20. Any idea how much that would cost to have done by a certified mech? Id love to do it myself but i don't have the time to get it done by myself with school and work. Mainly just concerned about cost. Would 5k be enough for a decent swap? Thanks guys :D