I agree with Phantasm. The Fisher F2 is a great little machine and I've seen them for 100 bucks on Craigslist numerous times; and one of them even came with headphones and a cheapy pinpointer. That's basically less than half price.
It's a more up to date unit and I think you'd notice a big difference. The Quicksilver is a fine machine for what it is. It's basically an entry level machine to learn the basics with. You WILL find treasure with it. OTOH, you may miss a few targets that other detectors will see better.
I started off with a low end BH (Tracker IV) myself and although I've since upgraded a few times, I found gold and silver rings, silver coins, old coins and lots of other really good stuff with it. Don't let anyone tell you you won't because if you just get out there and use it you'll find stuff. In this hobby, just showing up is well over half the battle.
The Teknetics machines are great too. I have a Delta I got used for 175.00, it's paid for itself several times over and has MANY hunts left in it. It's a really great detector for the money.
In the end it's about personal preference as well as how and where you're hunting. You want something that connects with YOU and one that functions and feels right for your hunting style.
Luckily for you there are some great machines out there these days at ridiculously good prices. The technology has really taken a nice leap in the last few years. It's really a great time to be on the buying end of this hobby.