A lot of replies here, so I'll assume what I have to say has already been said...so let me instead add my vote to these thoughts:
1. Hood - I hated them at first too, but remember that when you get a new one it takes a little while for it to stretch out and feel comfortable. Check out the merino lined hood by pinnacle, it's warm and comfy.
2. Dry suit. If you aren't diving for more than about an hour, you don't reply NEED a p-valve. So skip that if you hate the idea, and maybe get a relief zipper intelligently placed for before and after the dive if you want to make it easier. Also, look at pinnacle's black ice dry suit or a custom neoprene drysuit from seaskin (both have pockets by the way). You'll find that they dive more like a wetsuit because they fit more close to your body than other drysuits, so you'll still feel the same in the water, just warmer.
3. Don't just try to tough it out, so many things work better when your warm, from reduced chance of dcs to better sac rate.
4. Whoever told you that you're going to keep getting cold even with more protection is making zero sense. Another nice thing about going dry is you can add warmer undergarments to adjust to the water or how you're feeling that day, and also, the breeze topside will never bite you the way it will your wet friends.
5. Body oils... When you dive wet a lot, your bodies oils become depleted and your skin feels cold faster. I wonder if eating more oils or wearing lotions might help this, I dunno, I gave up and bought a drysuit before I could figure it out.
Good luck!