double star makes a very good AR-15. i haven't owned one cause i roll my own mostly but i have used plenty of DS parts in some of my builds.
to the OP
if you want an easy to clean ar-15 i would say try to get the chrome lined barrel. a one in 7 twist would be nice but a 1 in nine might be more practical and less expensive.
and get some good mags --- i like the P-mag or government contract GI mags made by D&H or C-products for 5.56/223
are you buying an AR or building?