Do you plan on Auto-x'ing it at all? I've been doing research on harnesses for my P5 and I know in my region, NASA banned 4 point harnesses for 2012. And generally you don't want 4-points anyway because of "submarine-ing", where you will slide under the lap harness and it can damage your internal organs. If you're going to run a harness a 5 or 6 point harness is the safest way. But not very comfy for a DD. But when dealing with safety belts, I wouldn't skimp out on them. I'd get some quality ones.
Schroth seems to make great belts for a good price. But there are tons out there.
I wanted some harnesses in my P5 last year but am holding out for an Autopower 4 point rollbar, 5-point harnesses and new seats. I had to sell my beloved Evo8 Recaros because they didn't have the crotch cut-out for the belt. But i understand even 4-points make you feel so much more secure in the car. I had some in my old Civic and I loved it. Just as long as you're being safe about it (and you're on the right track with the harness bar).