Since this thread has been revived, I'm going to go out on a limb here and say that, having owned lots of high-performance tyres (including the Goodyear Eagle F1s that some people mentioned), the tyres that most impress me are the tyres I have on my 156:
size: 215/45 17
Yeah I know - Westlake
It sounds like a boy-band, but these tyres are also sold under the Goodride brand (again, SV308).
I am amazed by how good these particular Chinese-made tyres are. It seems to be one of those cases of striking it lucky (there are lots of awful Chinese tyres: Triangle, Wan-li, Kingstar, etc. and I've driven those, definitely NOT something you'd put on an Alfa Romeo.) Common problems with Chinese tyres: not round, not balanced, poor-quality moulding, too hard, no grip in the wet, noisy, sidewalls turn brown quickly. These Westlake tyres have none of those problems...
Low noise (due to a fairly un-sexy tread pattern - for low noise, you want lots of small blocks and small grooves - the Eagle F1s had very long blocks and wide grooves, lots more noise).
Soft compound - really unusual for a cheap tyre - helps with the low noise and excellent grip in the dry. Good grip in the wet I believe, but I don't take chances. Definitely had no nasty surprises. No aquaplaning.
Excellent steering feel (low-profile tyres can ruin the linearity of the steering and give 'tramlining' - these don't).
Wears well enough for my requirements (I find my tyres perish before they wear out). I daresay that with the softer compound, these will wear faster than some other tyres available. NoControl mentioned 40,000km out of Goodyear F1s. What a joke for me that was... I got just under 10,000km out of my F1s on my 166
I'll be happy if the Westlakes do 20,000km which is three years driving for me.
Cheap - VERY cheap - NZ$90 per tyre (43 pounds), though I think retail price is usually a little higher. We all remember 'budget' tyres in sizes like 155/13. You can still buy those here to put on an old Corolla or something, but if you needed something lower than 60-profile, you had no budget option. Until now.
E-marked, and sold in Germany. That proves they are legitimate, acceptable tyres.
I can't recommend these highly enough - especially taking into account price, these are the best tyres I've ever bought. You can put on a full set of new, matching tyres, and it's cheaper than buying one known-brand new tyre (and compromising its safety by mixing it with old tyres).
Some of you may wonder where to buy them in the UK - I have no idea on that one
In NZ, I bought them from Tyrepro in Hamilton, but there are people listing them on Trademe.
EDIT: I just spotted the price bobda wrote... at £57 pounds each for the Kumho tyres, no-one will have much interest in my favourite £43 Westlake tyres... ah well
Over here, I was quoted the equivalent of £145 each for the Kumhos, slightly more expensive than the Eagle F1s at £133 each. I thought Michelin Pilot Primacy might be nice too, but £309 each... maybe you can see why I'm so happy with the Westlake tyres.