Very smart thing to do. I feel the same way.
When everyone runs after one thing, stop, look around and go in a different direction. Right now to start collecting for Turbografix or Super NES is terrible. Go instead for Xbox games, they are great and still cheap to get. In the next couple of years there will be 360 games and PS3 games offered very cheap. I bought in 2007 and 2008 tons of great and cheap games I wanted for the Xbox, 2 or 3 years after a systems death is the best time to collect for it. And there will be times when NES and Super NES won't be so high in demand.
The basic rule is to get these games when they are cheap and to be patient. (And once in a while buy some expensive stuff we just can't resist and REALLY want)