Everyone says that Type Rs are the bang for the buck sub. I have a 12" Type R (SWR-12D4) and it's decent. 2 10s should be louder than one 12 (in general). I would get them off amazon for cheaper.
Each 10" can handle 1000 watts rms. if you have the money you could get the Alpine 2400 watt rms amp (over powering them a lil won't hurt as long as you have the gains set right). or just get anything that is at least 2000 watts rms. Those alpine amps arn't a joke, my 1100 watt amp beats the **** outta my 12". Do you know what load your going to wire it to?