I have a Pro Shell Mountain Equipment jacket and can advise that it is super breathable (I get hot very easily like you). I've never had any moisture build up and it has never let water in. I would say it's over kill for the summer months however (unless it's pouring down) and as such I use this as my winter jacket. ME make awesome jackets I think, nice cut, well positioned pockets etc and the hoods are legendary.
For summer months I use a Rab Shadow fleece which uses Polartec Windpro fabric. Really good at keeping the wind out, warm but not overly and the hood is superb. Also has an element of water proofness. I use this in the winter too under my ME Pro Shell. I also carry a Berghaus Paclite Shell jacket in summer in case it gets a bit wetter. This shell is good as well but no where near as durable and not as breathable. I get moisture build up in this if working hard. This shell is not suitable for a bad winters day in my opinion - been soaked many a time when it's a down pour! Light and packable is where this jacket excels. You can pack it up into a very small mesh bag if you want.
Can't say anything about the Active Shell apart from I think it's quite new to the Gore Tex range and I'm sure it's even lighter than the Paclite Shell. If this is the case I don't think it would stand up to bad winters day or even a heavy down pour in the summer! Being light may ensure you don't sweat much and reduce moisture build up though.
As for eVent - some people love it, others hate it. I'm in the latter camp. Found the the material was more difficult to care for than Gore Tex, had moisture build up and I took a good few soakings in this shell. Does seem to be a lighter material however. This was a wee while ago now and it may have improved but I really like Gore Tex, has never let me down and you tend to stick with something you trust.
Go to a decent shop and try a few on for fit etc and shops like Craigdon in Perth give you really good honest advice. Even Cotswolds give good advice which is unusual for a big chain in my experience
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