If I were you, I'd save your money on all those high dollar parts, and stick with stock internals for now. Get it up and running so you can trouble shoot and get it reliable before going with a built motor.
If you want a good education on the rb25, start reading how JTaylor did up his rb25 Z. His is all stock long block, and it will spank my forged, high dollar rb26.
Have a read of JT's post's > http://forums.hybridz.org/index.php?app=core&module=search&do=user_activity&search_app=forums&mid=67&sid=8e63add93065fbb3d66376def6429abc&search_app_filters[forums][searchInKey]=&userMode=title
His profile > http://forums.hybridz.org/index.php/user/67-j-taylor/