In concession to WAF I've got Paradigm Atoms(rear-ported and wall-mounted) in white as my rear surrounds. I have no problems with the match. If I go to a surround music format(DVD-A or SACD) it might become an issue. I've got the Ascend offered stands and my wife doesn't have any problem with'em. You can use any stand that appeals to your taste. Any of those receivers should be a nice choice. I haven't heard any reports of sound being degraded with using the wall brackets Ascend sells for the 170s. I should be able to give a first hand account later this week as I'm wall mounting a pair in the kid's playroom.
edit- Welcome to the forum marko.