I've used both SBS A500(3k) and Inspire T6160(4k)
Both are excellent but I personally think that spending some extra on the inspire is worth because of it's crisp highs.The A500 lacks those crispy highs.
so if 1k is not a big deal go for Inspire but if it is, then go for the SBS...
You can also consider lansing s2621 and s2521 ...