there's little to distinguish most HUs in this sort of price range when it comes to SQ.
so as long as it has the features you want, and the build quality and 'looks', then go for it.
personally, i'd recommend the alpine CDA-7892 (RRP$629):
some of the features include:
*3 preouts
*4-channel time alignment
*inbuilt xovers
*excellent build quality
good luck