hey i have the same setup, the two 12 alpine type R.
the amp that i am usuing is the rockford fostgate 500s punch series.
its 1000 watts max power (really at 1150 watts max rockford underrate there amps big time)
500 watts RMS at 4 ohms at briged mode(really at 600 watts RMS)
250 watts RMS at 2 ohms at 2 channels,
125 watts RMS at 4 ohms at 2 channels,
i would not recommed not to get the xplod 800. i had it and it *****! no bass at all. got extremlly hot. had it on for only 10 minutes! its probley good for door speakers or low wattegs subs but not for good subs.
and the visonik 800 or the crunch 800 dont know about them have not heard them.
i would recommend the rockford fostgate 500s punch series for about 100-150 in
ebay.
or better yet its better if you get the rockford 551s power series for about 175-200 in
ebay.
the rockford power series is a way better amp because it has a
24db octave slope crossover, and better wattegs, this amp will not let you down.
and these amps will not over heat! i have these amp some times on all day long and it will get warm