Oh yea'

Pee Valve....I would not waste my money unless you are going to be doing really long or decompression dives. If most of your dives are less than 1 hour, you should be able to pee before you get in and hold it without a problem. Now of course if you are diving longer dive times, then you should have that or some other means with dealing with your pee.

As far as valve placement, it is pretty much standard at this point that the inflate valve will be in the middle of your chest and the exhaust will be at your left mid arm above the elbow. These are the most practical place and I would not reccomend that you change that.

The other thing you can do is attend a DUI Dog Rally or similar event from other manufacturers. They usually happen at quarrys, the manufacturers show up with all of their different dry suits in all sizes and you basically leave them a deposit and you can use the suit. You can exchange it as many times as you want for different styles so you can really decide what feels best to you, not just what looks the best on the shelf or the magazine ad. I don't think there is any cost either other than the quarry entrance fee (most are less than $25 for the day).