CXP22 is really a bit narrow for 32C tyres, you should be shopping for at least 23mm wide, maybe even more if you're not planning to fit super-skinny tyres at any time. Mavic A319 would work, but if you have a bit of flex in the budget then Rosebikes have a good price on DT TK540 at the moment, which is a much nicer rim.
why do the Germans - of all people - have their own unique non-metric size for wheels (28")?
I don't think they are the only people who use this terminology, for example Corima also use it, as do Vittoria. It's just an inch conversion from 700mm.
CXP22 is really a bit narrow for 32C tyres, you should be shopping for at least 23mm wide, maybe even more if you're not planning to fit super-skinny tyres at any time. Mavic A319 would work, but if you have a bit of flex in the budget then Rosebikes have a good price on DT TK540 at the moment, which is a much nicer rim.