Congrats on approaching your brake swap. You'll love the difference if your able to swap everything over.
With larger pistons, you want to be able to move move fluid- or your pedal will be super squishy feeling. So you'll want the Integra brake master. Moving that much fluid also requires alot of effort, so you'll also want the Integra brake booster, or the pedal will be super hard.
The proportioning valve seems to be a hit of miss. IMO, I think it would be worth it since the brake system will be dry at that moment any way. Just to make sure it is as 'good as factory'. I didn't swap my proportioning valve when I did a similar swap, because my 97 Civic DX Hatch has the same valve as the 2000 Civic Si with rear disk brakes. So I was content with that.
Do some research and find what part number you have for the proportioning valve, then compare it to other cars that have disk set ups. Chances are you'll need to swap it in order to have the correct pressures at the front and rear of your biased brakes. Unless you're Sol has the same valve as the 'VTEC' model with rear brakes...
Let us know how things go. Good luck.