I've heard good reports about Mushkin and it seemed to be the cheapest 2GB pack (with 2x1GB sticks rather than 4x512mb sticks) that I can find.
InnoVision is not very well known, no. However they had the cheapest SLI ready 7800GT I could find. Besides, I've yet to talk to anybody that has seen a huge difference in performance from brand to brand so I'm not too concerned.