My 2 cents:
Breathable? Definitely - Extends the comfort range in marginal conditions.
Relief Zipper? Get it now or get it later but you WILL need it.
Booties? Definitely - Not only dry feet but ease of ingress/egress.
Front Entry - Definitely

I bought a used Stohlquist and it's great but being an older model is not breathable.

Check APS as Luiz suggested, check the items "on sale" as they have a couple of drysuites discounted. Right now they are offering free shipping on orders placed before Jan 4 (verify).

Good Luck! You won't regret getting one.