That's a big hole in your pocket for a detector. I am going to suggest you buy at least 2 machines....Why? Because no machine does it all. Some work better for coin shooting. Some work better for searching for gold. And some just perform better in water, both fresh and salt water. I have over a dozen detectors. Many people who post here have several machines. Here are my top 3 machines:
GTI 2500- It can size a target in the top 6 inches or so, which allows you to make a guess with a high probability of accuracy on a targets size.. Using it together with target conuctivity, (target ID) you can concentrate on coin sized objects only, saving a lot of time by not digging junk. This machine is a fantastic coin and ring hunter. It also has a true all metal mode, which is great for relic hunting.
INFINIUM- I use it mostly for water hunting. It gets incredible depth in fresh water/salt water/high mineralized soil. It was designed to find gold in some of the most highest mineralized soil in the world. And, Garrett housed it in a water-proof case. So far this year, I have pulled out 12 gold coins with mine. It is a PI, and does have some discrimination capabilities ie "high-low" signals for gold and "low-high" signals for copper and silver. It also doubles up as a DEEP relic hunting machine.
Scorpion- It was designed as both a gold machine and coin/relic hunter. For me, it really excels with my Canadian Coinage. It bangs hard on our dimes, quarters, loonies & toonies, where most other machines don't hit as hard.
Now the GTI 2500 & Infinium do have a learning curve to them. I have seen some people buy one, get frustrated and give up. It takes time to really learn a machine well. Below is a link to the Garrett site in case you have never been there.
Good luck with whatever machine(s) you get.
http://www.garrett.com/hobby/hbby_division.htm