people with HK's love 'em. you should have no probs.. and as far as the 75 watts, HK has a tendency to 'undercut' their wattage output. in other words, their equip is probably pushing more watts than the 75 it says. plus HK's keep a good constant power band output when running all channels.. the cheaper units will claim to push 100 watts a channel, but its actually 50-60 when running all channels at full/loud volumes.
just to sum it up, the HK630 with the epic 60 speaker package will be just awesome. have no reservations in that.
bigjohn