Best amp for 2007 f150?

I just got my audio system installed today...My current audio setup in my 07 f150 lariat is an under-seat box with two 10" kicker CVT subs that are rated at 800 watts rms and 1600 peak for the pair. They are currently paired with a kenwood KAC-7205 amp....the bass is really good right now but I was told that I would get much better bass with a mono amp.... what would be the best amp for my subs? something that isnt too expensive either....I have 2 infinity kappa door speakers in my room right now that I'll pair up with my kenwood amp and get a new mono amp for my kickers.... what one should i get???