Thanks for the string advice. I found myself in Chicago this past Saturday, so I went to Chicago Music Exchange and I played their Epi IBG Hummingbird. It has the sound I like, as many of you suggested. While I was there, I wanted something to compare my J-200 with. So I played a Gibson pre-war style SJ-200 Sunburst with rosewood back and sides (I know it's not a fair comparison, but they didn't have any Gibson SJ-200s with maple back and sides in stock). It sounded absolutely incredible, like a choir of angels singing. I've never played any guitar, acoustic or electric ,that sounded that good (I've also never played a guitar with a price tag of $7,499.99 before, so yeah, it should've sounded incredible). I may have ruined myself for playing guitars that mere mortals can afford, but it was an experience I'll never forget (in a really good way). After I carefully handed the Gibson back to the salesman, I looked around for something of approximately the same jumbo body size/shape that had maple back and sides for a closer comparison with my Epi J-200. I spotted a Guild that fit the bill, picked it up and strummed it and yes, it too sounded great. Then I looked at the price tag and it was priced at $4,499.99, so again, no wonder it sounded so good. I left with a new perspective on what certain guitars actually sound and play like, so for me it was a very beneficial visit.
Later that night, when I played my Epi J-200, it sounded better to me. I expected the opposite after having played the aforementioned guitars earlier that day, so I was pleasantly surprised. I was using a different pick, but I've been playing it a lot, and now it sounds better to me than it did when I first played it. At present I think I'll keep it, and maybe I'll get a Hummingbird somewhere down the road.