Money vs Horsepower

Question for you guys.

Generally speaking, with cam specs very, very close to each other, how much more power will a solid roller make over a solid flat tappet? Or would you gain more/less streetability? I know that the whole not having to break the roller in would be nice, but I'm kind of a broke guy with 6 kids and, well, you know. I have a roller cam that I was going to send to Bullet to get reground, but I still need the lifters, valvesprings, and machine work to make the springs fit the heads. Or, I could sell the roller, get a solid cam/lifters (lunati spec'd one very close to what I want) and not have to go overkill on the springs, etc. I could drive it and have fun with the kids this summer.

I guess the real question is, is a roller worth it for mostly "spirited" street driving? I'll have 17" wheels, and I'm building it as an all around car (handling, power, safety, etc, not just straight line).

If you want, I'll post the specs, but then it won't be a general question anymore.