Yes the SW 150 is the curve ball here and for the price and quality you wont do better , a 150mm scope will always show more than a 120/130 scope no matter how good it is .
And I beileve the lovely EQAZ6 would hold the SW just fine .
If it was my money I would grab the SW Esprit ( I too read that comparisim and was impressed as well ) , a lot of 6 inch APO sweetness for very little money
,,, well compared to a 6inch Tak or AP , TEC , etc , etc .
Brian.