Got some Sony 360w (80w RMS) 6x9s doing nothing in my loft so I want to put them in my MK4 Astra.

All four outputs from my JVC head unit are taken up with stock speakers, which are alright, so I want to run the 6x9s off a smallish amp from the preamp output of my head unit.

What sort of amp would be suitable for under £100?