Agreed for the price the Polk Db components are great and the Alpine PDX-5 is an excellent amp (compact in size and clean power) that will run everything in your car for about $350-$375.
Another amp you may want to look at is the Kicker ZX550.3. Its not as clean powered as the Alpine but its also about half the price and has 120 more watts on the sub channel than the Alpine PDX-5. Sonicelectronics.com has the Kicker amp on sale with a 4gauge install kit + free shipping for $199.
The Alpine is a better amp than the Kicker and I would suggest the Alpine if you're going to go with the Polk Db's or even something better.
Having said that the Kicker amp and the Polk Db's are middle of the ground equipment and will work well together for a great price. As you said you are'nt looking for a competition system just something that will sound good and be reliable.
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 STILLEN G3 / F.I. TDX (NO RESONATORS) / F.I. LTH / UpRev Tuned / BC-Racing ER Coilovers / DIY Oil Cooler / Short Shifter
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