When I did my OW certification, I bought a wetsuit without even knowing if I'd like diving (or if I'd even want to dive in the cold waters of socal)....I just couldn't get past the idea of being in a wetsuit that someone other than me had peed in...
That's a tough call though, as having your own BC and reg is really nice. Maybe look into buying used BC and reg, and spend the money you save toward buying your own wetsuit.....I don't know. Good luck with your decision!