I would buy used for your first bike, something you're not worried about crashing. The Husky is a great bike, not a beginner bike though, not mellow enough, it might be a 250, but it is a completely different animal, full on race bike is what it is. Probably stay away from the DRZ400 too, even though it was suggested, start small and work your way up, is a good motto to have.
Wouldn't knock the aircooled bikes, they are BOMB proof, change the oil every 5 years, and adjust the valves...well never, and you're good. One of these days I want to toss a XR400 engine in a CRF450 chassis, to make the perfect Baja bike. Fuel injection isn't perfected yet in the dirt bike world either, it is proven to be finicky...plus carburetors you can usually fix along side the trial. Once you get a carb dialed, it is extremely rare you'll have a failure, FI, not so much.
Given your size, I suggest a CRF230 or XR250, both air cooled, no radiators to smash...because you'll be crashing a lot on those snot slick roots of the East Coast woods.
The XR sits a little higher than the 230, should go take a look and sit on them to see how you feel.
I get a lot of my gear off ebay, save 100's if not 1000's of dollars. A lot of brand new closeouts, and used gear, from people who gave up riding
or have gotten too fat to wear.
Decent boots like Alpinestars Tech 3's are a good starter boot, you can find $100 Snell/Dot approved helmets. Cheaper
helmets must meet the safety regulations jut the same as the high dollar versions, you just give up some features, like venting and removable/adjustable padding.
Deals are out to there to be had on the nicer helmets, just have to look.
You can do a lot with a 230, just watch this video, riding starts at 2:10
http://www.youtube.com/watch?v=hiF8Nen6lYU
Look at the Yamaha TTR230 and the WR250R as well.
I'll throw a curveball in there too, The Sherco XRide.
http://www.sherco.com/caracteristiques-produit-en/product/x-ride-125.html