Trusted store for apple replacement parts

hi,

couldn't find a general "apple" hardware forum, hope this fits here. Decided to resurrect my powermac g5 quad by looking for a logic board. anybody here have experience with the online ebay or other stores selling logic boards such as dv warehouse or welovemacs? searching online, I found a lot of negative comments/bad experiences, along with very positive ones as well. figured asking creativecow people would yield a more meaningful opinion. any help would be appreciated. thanks!