I'd say yes, since I'm currently running a GTX 480 SC, an i7 920 oc'd to 4.2 GHz, and 6 hard drives in this system without any issues.  It's a solid power supply that hasn't given me a lick of trouble.

For one GTX 460?  A lot of TruePower Trios would be sufficient.  That TPQ 1000 would be more than enough, but if you do go for a 1000W PSU since you'd be very ready for many future upgrades, this is a better investment since it is capable of an extra 10A or 120W on the +12v rail.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817256057&cm_re=st1000-_-17-256-057-_-Product

The TPQ 1000 has an 840W/70A +12v capacity.  Some 850W power supplies are capable of this, and the +12v rail powers modern motherboards, CPU cores, drives, fans and video cards.  So an XFX Black Edition 850W and Corsair HX850 is a better investment than the Antec TPQ 1000.  Those 850W power supplies are less expensive, more modular connections, more efficient, higher end capacitors on the secondary side (Teapo vs Japanese caps, mostly if not all Nippon Chemi-Con on the secondary side in those 850W units), and better overall performance (better ripple/noise/spike suppression).

I'd go for a higher wattage unit for that, especially since if you run GTX 480 SLI you'd want an overclocked CPU to alleviate bottlenecks.  The Silverstone Strider Plus 1000W is a good PSU for that unless you go for insane overclocks... and it costs less than $200.

Because Corsair has a 1000W power supply also.  Despite being worse overall, the Corsair is more popular since fanboys recommend their PSUs everywhere.  You made a great move and I'm glad I could help you.