-Protein rest is about 122f to 130f
-Saccharification rest is about 148f to 160f depending on how much "body" or mouthfeel you want in your beer. If you are doing the thinnest pilsner, do a protein rest and then Sacch rest at the low end, 148f. If you are doing a nice thick stout, you'd Sacch rest around 157f or more. Ales in the middle, usually 153f to 155f for me. Stay below 170f or you can get grainy astringent flavors in the beer.
OZ - I've heard that protein rests can leave a beer watery, especially when using a fully modified malt, as most are these days. In a pils or a light lager that's fine, but for a stout or a brown...?? The Wit will be fine too as the Wheat will add to the body and the protein rest will loosen up the mash for a good sparge, but for most ales, etc. I've read to stay away from the Protein rest. Any thoughts on this?
2Dog - I use a 5gal cooler setup. A 60qt cooler is 15gal, right, so you should have PLENTY of room to just mash in at 122f - 128f, and then add more hot water to get you to the Sacch. rest temp. You can use software like Promash or StrangeBrew or others to figure out the amounts, or you can check
http://www.howtobrew.com for an online version of Palmer's How To Brew. he has all the formulas you need there...
Of course, for a Pils or other malty lager (Oktoberfest/Marzen), some believe a decoction is the ONLY way to get it right...
Rob