Luke and TD1, I'm ditching the tarp and bivy combo for all but the warmest of hunts like NV or UT mule deer in August. Spending hour upon hour wrapped up in that ID bugaboo bivy made me claustrophobic and definitely put a damper on my mood during all the rain. For a pound more I could have a bomb proof two person tent that I could take just about anywhere.
Right now I'm looking at big Agnes copper spur 2.
Big Agnes makes good stuff, but they put #3 zips on their light tents, which in my book don't hold up well at all. If you use it 5 nights a year this probably isn't such a concern. The Copper Spur is a great summer tent, but anything more than moderate snow will squish it in a very amusing and non-functional way.
To fight condensation you need air space and ventilation. Look for tents which can vent and simultaneously keep out rain, as well as larger mids which can do the same.