The question really depends on who is asking it. Have you always wanted an AR? Is it one of those things that you've planned on getting for a while? Or do you just plan on keeping a good rifle for "just in case"? If you REALLY want an AR, and always have, I would probably sell an SKS or two and use the proceeds to fund a build. If you look closely at auctions ending at obscure times on gunbroker, you can get a stripped lower for 200 bucks. I would also spring for a few magazines, a butt stock, and some .223 components + reloading press/dies. I predict everything else will be plentiful and cheap this time next year.
Unspoken, I like your trade. I would've taken that and walked out the door with a chubby.