RX8SpdDmn

Hey, guys. I'll admit that I haven't done much research on the topic myself, as I'm looking for suggestions first. I will be doing track schools with my RX-8 and would like to have a set of harnesses in the car. I would like to have belts that buckle in, so that I can quickly remove them if someone needs to sit in back. I will probably use them most of the time on the street. Do they make ones that buckle the top straps to the child seat harnesses in the back seat? There's the anchor point just behind the rear headrest, and the two behind each lower seat cusion and seat back. It would seem like it would be easy to clip one into the anchor point above the rear headrests, and the lower belts could bolt down to the floor.
I checked out Schroth first, as I'm familiar with them from BMWs, but I don't know who else is making good belts for these cars. I want 4-point harnesses (I would consider 5-point) with a quick-release buckle (not the old-school seat belt buckles!). I think I'd want 3" wide straps, but maybe 2.5" would do. I really don't know about that. I'd like to have an option for them to be red, if possible, and as inexpensive as possible while meeting most of my criteria.

Please give me suggestions and pics if you've got 'em! Thanks!! :D