i play anything to be honest,but mainly i need it for my band,and since we play at school i mainly need it for pop punk kinda stuff.well basically it needs a good gain channel.but at home i play anything.
my pick around that price would probably either be a laney vc30 or maybe a peavey classic 30- I prefer the laney, but the peavey may have a little more gain.
ashdown fallen angel or randall rg50tc would be worth a try too, and marshall dsl.
It really depends how heavy you need to get- I think I could play pop-punk with a vc30 (certainly if I could crank it), but that doesn't mean it has enough dirt for you, lol. And of course it also depends how versatile it needs to be when you aren't with your band.
The peavey windsor is a nice amp too for that 80's hot-rodded marshall type tone on a budget- it's worth a look too, the head is about £70 under budget, but you'd probably struggle to get a decent cab to go with it. and also 100 watts is a lot!
alternatively you could look second hand.