^^thats a good choice right there if you are running a single.
If you are planning to run a pair of TS-W305DVC's you will need 400 to 800 watts rms into a 4 or 1ohm load to get the full potential out of the speakers.
I say 4ohms or 1ohms because with a pair DVC 4ohm subs your only wiring options is 4 or 1ohms.
Kenwood KAC-7252 puts out 500 watts rms in to a 4ohm load and can be purchased(in Canada) for $300 at a retailer, you will need to haggle though.
Specifications for the TS-W305DVC are as follows
Size 12"
Woofer Cone Material Composite IMPP cone using interlaced KEVLAR® brand fiber
Surround Wide Roll, Three-Layer Fiber Woven Radial
Voice Coil 4-Layer, Long Voice Coil
Voice Coil Bobbin 12 Slit Aluminum
Damper (Spider) Y
Projected Pole Yoke with Vented Pole
Magnet Construction Double Mass High-Power
Gasket Molded
Specifications
Watts MAX. Music Power 800W
Watts Nominal Power Handling 400W
Frequency Response 18Hz ~ 2kHz
Sensitivity 89dB
Ohm Rating SVC:4, DVC: 2 or 8
Recommended Enclosure 1.5 Cubic Feet
Accessory Grill UD-G305
If shopping online, your 300 dollars Canadian will magically become 225 dollars american, I strongly suggest you up your budget to 400 dollars Canadian.
225 bucks shipped and tax in for an amp that will do 800 watts rms at 4 or 1ohm (ideal) is going to be tough to find.