I dont know anything about the sub in your first link but you usually want to steer clear of the Pyle gear. Several years ago they made decent mid level products but the gear went right down the tubes about 8-10 years ago.
I also didnt check the specs out on the original speaker you wanted to use. I was simply using the spec's from the amps you had posted in the links.
Here is a Memphis amp that would work the sub over quite well.http://cgi.ebay.com/Memphis...QQrdZ1QQcmdZViewItem
Heres another Kicker. It is rated at 100 watts. 10 Watts over the peak power of your sub.http://www.overstock.com/El...2667466/product.html
In most cases you can power a speaker with more power than they are rated for provided you have good clean power supplied to the speaker.
I wouldnt be affraid to run the sub on either of the above amps. If you are concerned about exceeding the specs on the sub the memphis is 10 watts under the max power rating.
There are more options out there than the above amps. These are simply a couple that I ran across in a quick search. A couple things I would recommend you look for when you purchase a amp:
1) Make sure the amp has a built in low pass crossover. This will keep the vocals out of the sub and allow it to play at a louder volume since you wont had as much distortion due to it trying to reproduce the higher frequencies.
2) Try to buy a quality amp. A general rule is roughly 1-3 watts/dollar, For some reason the lower output amps actually cost more $/watt than the bigger amps. A few years ago a amp in the sub 100 watt range would have been easy to find and would have ran you roughly $100-150. However todays bigger is better phlosophy <sp??? means a lower powered amp is not in a high demand causing them to cost more than the higher output amps.
Last but not least. Years ago several companies made 6 and 6.5 inch woofers. A quick search for a 5.25 inch woofer turned up almost no results. I found a few speakers but they were from companies that I would not recommend to you. If you find some more speakers link them up and I will be happy to give you my thoughts about them.