Parkgoons, I think Xsound has some (brace for unintended pun

)
sound advice. If you'll be using the SuperCube for 2.1 listening as well as HT usage, you'll rarely want to throw anything lower than 40Hz at your towers, even if they're good down to 25Hz. The SuperCube is built for low frequencies and more often than not, it'll sound better than most towers from 60Hz and below.
I, myself, am a pretty big fan of the VR12. Considering its price for performance, it's hard to beat. The VR3s or VR-M90s would be an excellent match for the VR12 and SuperCube. The VR3s would be the better value of the two, but if you've got the money, the VR-M90s are excellent for two channel listening. If you're listening to fairly low frequency source, the VR-M90s would pair well w/the SuperCube also.
I've currently got a pair of VR3s and a VR12 for my front sound stage, an SVS 20-39 PCi matched up with an RX-V2500 used as a pre/pro driven by an Outlaw 755 amp. The musical performance from this setup is everything I could ask for at this price range. The VR3s and VR12 take everything I can throw at them w/the Outlaw (200W x 5) and don't distort in the least, even 5-10 dB above reference (approx. 110 dB), which can be extremely loud, even for my tastes..
For the money you're looking to spend, I would consider using the 1600 w/a solid 5 channel amp paired with VR3s. Even if you don't go w/the VR3s, you could get a decent return selling the VR12, put it towards another center and still use the amp paired w/the 1600 for an excellent 2 channel system as well as having ample power for a 5/6/7.1 setup for multichannel music and movie soundtracks. In my experience, off loading the mains or mains and center to an external amp substantially improved the quality of the signal... -TD