Many others have raised an interesting point that I'd like to underline:

It's very possible that, after riding a bike like a "comfort" bike for a while, especially if it's a decently good one (not a cheap bike from Walmart for example), you'll be hooked and you'll want to get a different bike, a faster bike, etc. (Which will be more expensive, I'm afraid to say...) It's not clear how long this process will take you, but it's quite certain that it will happen.

We are in quite different situations, but my story will give you a hint of what might happen to you eventually. In my case, I had my hybrid (which was a "performance", a trusty Trek 7100 fx, not a "comfort", but the difference is not that huge) for about 2 months before I wanted a road bike. I got the hybrid because I didn't feel very confident riding in the racier position at first. I had been riding beater bikes all my life and the step to a $1000 road bike was quite steep. But I got hooked to speed and wanted MORE of it pretty quickly. I also became a hill-eater, but that's another story.

Despite the fact that I nearly regretted getting the hybrid in the first place, because I "grew" out of it pretty quickly, I think it was the best idea for me. I started with a bike that suited my level of skills, ability, comfort and confidence. That hooked me to cycling. If I had gotten a bike that was racier to begin with, maybe I would have been too uncomfortable to really ride it, and I wouldn't have been hooked.

Bottom line: Get a bike that you're really comfortable on, that you feel confident riding. This will help you build skills and above all confidence. But also be prepared to want to upgrade to a different bike in a few months. That's okay. Start saving now though.