From memory P6000 are quite a medium/soft compound tyre, so, notwithstanding different characteristics of tread patterns etc you may want to either stay with the Pirelli brand and go with the model Al suggests or perhaps look at something Like Kuhmo KU39 or Toyo Proxes T1-R
I found the P6000 to be pretty dire on the Omega. Not sure it was just because of the P6000's design age (as they worked fantastically well on our old Rover). A seemingly contradictory combination of soft-ish tyre and low grip led to horrific wear rate and not much grip led to a most unsatisfactory result, similar to the Avon ZZ3's which lasted me 4k (only beaten by the equally shite Continental SC5 which lasted 3k).
Kuhmos were quite impressive for the (then) cost, but lacked feedback for when they were about to let go, which led to some serious clenching at times. Due to the (now) high cost for essentially a mid range tyre, I'm not sure they represent good value.
None of the budget tyres, and I do mean none, are any good. All suffer the age old budget problem of the differential between wet and dry. If the tyre labelling is to have any meaning, it should have a dry grip rating as well, and ratings tested at half worn. Nexen N6000, despite poor grip, deserve a special mention for very good ride and stability, unless you need to accelerate, brake or turn

Autogrip is definitely a brand to avoid on any car - after you've taken a couple of mm off them, they *WILL* kill you as soon as the road gets damp.
As VXL says, everyone needs something different from their tyres. Some need tyres that last a million year, and grip is unimportant. Some need a resistance to tramlining (maybe motorway milers?). Some need outright grip (enthusiastic/spirited drivers, and those with an absolute safety consciousness?). And clearly from our experiences and tests, what works on a little FWD shitbox doesn't mean it will work on a large RWD tank.