so i think i have the speakers picked out im going with Infinity Reference 5032cf 5.25-Inch, AND infiinty reference 6030cs 6.5inch. do i need to get an amp for both the 6..5 component and the 5.25 coaxial? or just the components? also i was looking that sa-10 its kinda steep is there anything else in a better price range that still will do what im looking for?