What is it going to do for you that the other bike you just got isn't doing?

If that is a older model, then it's probably worth half the asking price. At least to me. Mainly because the components are dated. Also, you should check to be sure it has enough clearance to put the size tires on it you will want. Some older bikes 25mm wide tires might be pushing the limits. Don't know for sure on that specific bike.

I don't think Quick's ever had suspension. You'll pay dearly to put suspension on it or even just any new fork for any bike. So if you want suspension, buy the bike that already has it on it. Less weight will help on hills, but for shorter distances you should be able to deal with the weight on steep hills if the gearing is low enough.

If you are only riding 20 miles, then most any bike will do to get you 20 miles. Some might leave you a little worn out and some might be harder to get up really steep hills. But for just 20 miles it'll be gearing that allows you to overcome that.