Hmmm, well I had a few things bought FOR me and a whole mess of free stuff but my actual first purchase ever was CasualV3 by outoftouch over at DAZ along with Victoria 3 High Heels. They were both on sale for like $2 and some odd sense so I had to get 'em and I am still very happy with both. I had bought some scenes before that but they were free so I'm not counting those

My first renderosity purchse was of course more outoftouch stuff (Cecile Hair, Engage for V3 Sweater Set), aoaio's Sweater Set for V3, and Pinball's V3 Custom Dress w/20 Textures. I think they were good choices, I still use them all