a speaker an sub question

okay i got infinity kappa 3ways 6x9 in the back of my car and kappa 6.5 2 ways in the front i got a pioneer premier deh-640 deck i think thats the number. i need to get an amp and im trying to figure out what to get i was thinking a kenwood 600 watt but im just seeing what you have to say, and my second question is what do you think is better 12 inch kappa perfect subs or 12 inch alpine type r, or is there another sub around that price range that is better? thanks!

for the same price, look at the adire audio shiva. they are a tad better than the perfect and the type R, IMO. if you need a bit of SPL also, don't look at the perfect. infinity was serious when they rated their sub at 350 watts RMS. the shiva is rated at 650 watts RMS, but i recommend running about 400 to one. they are efficient subs.

what does imo and spl mean?

IMO= in my opinion
SPL= Sound pressure Level (the loudness)