Can this PSU support my future system?

You'll be fine. The most important aspect about power consumption is the amount of amps on 12v rail since the most power hungry components feed off of it.

The following is a estimate of power drawn from the 12v rail under maximum load:

E6400 @ stock speed.........................................50w CPU Power Consumption Chart
7600GT @ stock speed.......................................36w GPU Power Consumption Chart
Typical 250 HD..................................................16w
Typical DVD Burner...........................................14w
2 120mm Case Fans..........................................12w

Total Power Consumption on 12v rail..................128w
Total Amps used...............................................10.7a

All other componets draws power from the 3.3v or 5v rails.

If you are overclocking then:

E6400 @ 3.2GHz.................................................73w
7600GT (XFX GeForce 7600 GT XXX Edition).........38w

That would boost the estimated power consumption to 153w, and amps drawn on the 12v rail to about 12.75a. Well within your PSU's specs.