Buying Subs

Im planning on getting new subs. I have a 1600 watt amp. Should i get (2) 700 watt subs or should i go with (2) 1000 watt subs?

wat kinda amp, wat kinda subs u lookin for?

I have an amp that i bought off the internet. Its a Cyclone 1600 watt 2 channel mosefet amp. It worked pretty good in my old car. I want to get some good subs for a good price. Do you have any suggestions? I found one pair of subs that are 2000 watts, 800 oz. magnet, 90db, that claim to have lots of bass. I found another pair of kenwoods that are 1400 watts, 120 oz, magnet, and 93 db.