it really does depend on what kind of power you are going for, and i think your quite fortunate being a girlie you haven't got flamed for asking this question , seriously, you need to do some more research, look at members cars/garages and maybe get a ride in a single with the kind of power you are looking at, if you keep the power to around the 450-500 mark you can get away with keeping the budget well down and still have a car quicker than 95% of whats on the road, if budget is not an issue go for it.
Granted i am in the middle of spending a lot more money on my car (this is choice not necesity) but have a look in my garage at its current spec which has been running without any major issues (touch wood ) for 4 years on a budget at least half of the figures i have read in this thread:taped:, the other thing you would need to do if you cant/dont have time, to do it yourself is find a reputable garage that is not going to do shoddy work or rip you off.