I've had a range in the time I've had the GTV - bear in mind it's a heavy front driven coupe with a fair lump of power, so tyre wear and grip are pretty important factors!
I've had cheapies, (GT Champiro, Wanli, Nexen) And they're all crap, Bought the car with them on..
I've had a full set of Toyo T1-R's, recommended to me by the tyre place and believing the hype/marketing information I thought they were ace - then realised the car squirmed on them under braking, they were quick to lose grip, and the fronts only lasted 5k miles.
I binned em as soon as I'd worn them, and seeing Pirellis on the net for not much more (About a tenner more than the Toyos at £98.00 a corner) I took the plunge and ordered a full set of Pirelli P Zero Asimmetrico's (225/45/17).
They're fantastic, still waiting to see how the wear holds up, (although initial impressions are that they're wearing better than the Toyos), very grippy, great in the wet and they've got a sort of old performance look to them, especially the sidewall lettering and chunky tread.
Not to everyones tastes as it's a functional tyre rather than a posing tyre, and they're pretty rumbly (Wheel bearing noise) but for the performance per pound I'd wholeheartedly recommend them.
Not driven on a tyre which communicates exactly what the car's up to so much - The steering's incredibly sharp, and turn in's great fun.