With that amplifier, the sub is being extremely underpowered. The Amp only puts out 120 watts RMS bridged and the sub is recommended to run 400 watts rms. I would recommend this Amplifier
, it is a perfect match for the sub you are thinking of and it is relatively inexpensive, it's on ebay for around $120-$130. Also, the kenwood sub has good ratings on cardomain, so i think it is a good choice for your tight budget. But again, i would go with a stronger amplifier to get the most out of the subwoofer. Here are the sub specs on Cardomain
. Hope this helps you out a little bit.