If the games are written for your own pleasure and not commercial do not waste money getting an artist. Get a good 3d design package like Silo or 3ds Max and have a go yourself.
Yes, don't waste a few hundred dollars on an artist who will create high quality artwork for you. Waste a few thousand on 3ds Max which will keep you busy for about a year learning all the intricacies of it, after which time you'll be capable of producing inferior artwork because - like GFK mentioned - you realised you don't have any talent.