Abranet is excellent, very quick cutting and dust free when attached to the hand block and hose plugged into your vacuum. I would think grit wise you would need 80, 100, 120, 180 for the outside and possibly 240 for the inside to finish off. 80 is very course, so it's use depends on your planers finish.
We stock it from 80 through to 400 but for some reason Mirka UK don't have 150 grit in the small 70x125mm strip size, you may want to opt for the larger 70x198mm size if your windows are big.
For years my favourite abrasive paper was 3M 618 but we are now using Norton 3X ProSand which out lasts the 618. For 3X ProSand I would recommend 120, 150, 180, 220.
Cheers Peter