Best sub set-up for Yaris hatch?

[7:34pm]

After two years or so I think my Infinity Basslink is dying. It's starting to pop and thud intermittently and Google relveals it may be a mosfet or capacitor of some sort that needs to be replaced. I may fix it, or I may not. I think this time I want to do a proper sub + amp combo, one that fits well in the hatch and isn't an eyesore either. Any suggestions for a clean and simple set-up? Don't think I need more than 300rms.

I've been told that the Massive Audio subs are really good, and they make a decent 6.5" and 8" sub:
http://www.sonicelectronix.com/item_...-SUMMO-84.html
http://www.sonicelectronix.com/item_...-SUMMO-64.html

This is what I currently have