I did about 30 dives last first year when I was certified, and rented all my equipment. I actually recommend doing that, as it gives you some exposure and experience to different gear, and you can decide what you like in an informed manner.
That said, I think regulators are fairly bulletproof (knock on wood) in their simplicity. Yes, they should be maintained and serviced regularly, but listening to some of the people here, you'd think there's a 50% chance of a reg failing every time you rent. Take it all in perspective. If you plan to dive so little, you're definitely coming out ahead by renting for a while, since the economies aren't going to catch up to you as quickly as if you were diving every weekend.
If you do find yourself diving more, you can always reevaluate.