What stage 2+ are we talking of here? K03 or K04? as that has a very large bearing on what tyre i would choose.
If its just 280hp in a K03 i think you will be best going for something like the Conti5 or Eagle F1 V2. If its 340Hp then IMO you need to be looking into semi slicks.
....A very good and fundamental point
And one which I had forgotten to consider in offering my advice
~270 bhp on a K03 Stage 2 with Eagle F1 V2 asymmetrics is indeed a very well balanced combo, even on a wet or dry trackday (assuming you just want to enjoy some fast enthusiastic motoring, like wot I do, but without trying to break any lap times).
At a very wet trackday at Spa I had an instructor in my passenger seat some of the time and he said I was the only guy who had chosen the right tyres - But he didn't know that they were the
only tyres I had! - Eagle F1 V1's.