Word of advice about quilts, make sure you have a ground pad system that you know will keep you warm. I'm not knocking on quilts (I'm making my own for 3-season use) but few people mention that the weight savings are tempered by needing a more robust sleep pad system (although the entire system still comes in lighter usually).
If you're still interested a regular bag though I would definitely check out Western Mountaineering or Feathered Friends. I just bought a WM Ultralite and I've never had a better fitting sleeping bag, feels tailored made for me! The caveat of course is that both are expensive. I liken them to Ferrari and Lamborghini of the sleeping bag world. These are companies that don't rely on marketing hype, instead focusing their energy into producing the highest quality products that they can.
Their sizing is spot on, so a long "FIT" 6'6" meaning they are actually cut a bit longer inside (sometimes the fit length is actually how long it is inside and ends up a tad short for users at the limit). They also both provide the Shoulder/Hip/Foot girths which will really allow you to dial in the fit.
Also they've both been around for decades and rate their bag temps accurately, meaning if it's a 20F bag then it will be warm at 20F in light baselayer clothing, not just survivable.
For your size and a 10-20F bag, from WM I'd look at the Badger or Alpinelite, maybe the Versalite for a snug fit (ie more thermally efficient).
From FF I'd look at the 10F Raven or the 20F Swift. FF doesn't have quite as broad of a selection of wide sized bags but they do custom work (albeit pricey). The benefit to FF is their "nano" fabric which is highly water resistant and durable. It's a product from Schoeller and basically works the same a lotus leaf, water, oil, ketchup, simply can't stick to the surface and wipe/rinse off with ease. This may be beneficial to the wetter parts of the South East.
If you want to try quilts I would recommend making a synthetic one. Not as light as down but pretty easy to make and for 30F should only weight 1.5lbs or so. It'll also be cheaper and if you don't like quilts it can still be used as an overbag to turn the 3-season bag into a 4-season bag.