Hard question there Josh. Wolf's advice is well founded, and you have to try and convince yourself where and what will you be mainly targeting. Plenty of well priced coin detectors on the market in you're price range. They're all great on coins and treasure, but searching for gold in the "Triangle" or over in WA,.....in a nutshell...no good.
PI's are about your only real chance on getting "consistent" nuggets. A few on the market now, but the Minelabs are still head and shoulders above the competition. As you live in the Triangle and are lucky enough to have plenty of time to swing a machine, I would save a little longer and invest in a 4500.
There's an old saying amongst the detector fraternity, and that is 10% of the detector brigade get 90% of the nuggets. Reality has it that everyone of those guys has a 4500 or better. While the SD series still get good gold, and are great for those on a limited budget and time frame, the amount of time at your disposal in "prime locations" is enviable.
If you buy a "cheap" detector "Now" and head to the locations you have access to, I'll put money on you having it on the market again after 6 months
. Lot of people will disagree with me, but someone like yourself working in the WA gold mines and living in the GT won't take too long to find the balance on detector upgrade with the gold you will find. Give yourself the best chance and you "will" get rewarded.
But all things said, I'd get the latest Minelab PI you can stretch the budget to.
Wal.