The Disco Potato (GT28RS) is default with the .8 housing the smaller .6 is the option.
Response is tricky, the GT25 is smaller (320Hp) might be worth a look, but the Potato (350Hp) has a better spooling reputation. Mind you that is on an SR20, but with the default 'big' housing.
By golly what a difficult choice.
Best bet is to find someone with either and get their opinion.