Depends....
Look over at the group build forums... there's a GB now that is called "Budget Modelling"... some of us are in it... build the best kit you can for $25.00. That has to include paint, brushes, glue, etc....
Browse through the techniques forums as well... or search for the specific technique you're looking for. I pay close to $1000 a month for child support, so I am definitely not one of the "affluent" modellers, if there is such a term. I agree with Rich also, in that your imagination can save you $$... If you have a local hobby shop (LHS) nearby, look for closeouts and clearance items. Just because a kit is a few years old, doesn't mean that it's bad....
Anyways, that's my suggestions. I just got back into this a couple of months ago after being out for about 15 years, so it's taking some time to learn the ropes again. One thing I will echo from previous replies - look at the hardware store or Radio Shack for tools instead of the LHS. I found a $4 pair of sprue cutters that work just as well as the $10-$15 ones...