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This is where I think the 300bhp restricts things. With the price factor I think it favours big old barges... and without sounding like a broken record I don't get why you'd want a massive car if you've got a massive people carrier.
I don't think you could get a mk5 Gti to 300bhp. But with some light tuning mods whatever bhp it makes will be felt a lot more than in something like the Saab or whatever old Ford made jag fits the brief.
So my vote is a mk5 Gti. £5k might even have money for new tyres and mods.
https://www.autotrader.co.uk/car-details/202110068180043
Remap might get it close to 300 and still have some cash left over for decent tyres!