The Satellite is an entry level road bike...531 tubing, Sora 8 speed STI brake/shifter, dual pivot Tektro brakes (typical road design that limits tire width), and basic 32 spoke wheels. Entry level doesn't necessarily mean unreliable, but is always heavier.

The Nova is a cyclocross bike...cantilever brakes (permit wider tires, good for trail or commuting), 36 spoke wheels (to better absorb trail bumps), and mid-level 105/Tiagra components. The 631 tubing is lighter, but I don't know about the 'all up' weight of one versus the other.

I have the 2001 Nova for a commute that's all road over very hilly terrain. It's been great. I got it at a remarkable clearance price, though, not the $1000+ of the current model.

If you're on a tight budget why not find something used (the local craigslist) for a couple of hundred? If you find you really like cycling you can sell at a minor loss (or gain, if you're a real salesman). With some riding experience and reading in the forums you'll be able to better judge what bike suits your riding area and preferences.