Straight stock amp replacement?

[Aerotop Dave]

What's a good, £50-ish stock amp replacement that fits under the seat?

I'll upgrade the speakers next year (including the subwoofer) but seeing as the amp is out at the moment I might as well replace it in anticipation of this change.

Anyone got any suggestions?

[Matt T]

£50 is pushing it, i can suggest a few very decent ones for around £100 :)