Something to consider when you start powdercoating is to make sure there's no plastic or rubber hidden inside the part you're powdercoating. Suspension parts look great powdercoated, but be careful of hidden bushings, seals, etc... I wouldn't do tie rod ends, idler arms, or anything else that might contain plastic, rubber, teflon or the like. The heat needed to melt/cure the powder will make these materials brittle, and they'll fail over time.
I checked with a local powdercoating company here, and he told me they could do the frame for a truck project I'm working on for about $400 - and that includes the prep. I don't think I could prep and paint it for that price.