The new drysuit is a Pinnacle Evolution Freedom Drysuit Rear Entry. I live in Pennsylvania and would like to be able to dive year round.
Hey, that looks like a decent trilaminate shell suit! Congrats! I can't believe how inexpensive that model is right now.... ($670 at Leisurepro). Let us know how you like it!
Anyway, I agree with those who recommend layering undergarments to be able to cover a broader range of temps.
For temps above 45F, I use polypropylene long underwear and fleece outdoorwear, of varying amounts or thicknesses (obtained from Cabelas).
Your Pennsylvania dives, like my local inland dives, might often involve spending significant amounts of time in two very different temp zones, that is, above and below the thermocline. In the summer, that could be 75 versus 45F!
One nice thing about fleece, if you're getting too warm, venting the suit will squeeze the fleece nicely, letting you cool off. Adding air will let it loft back up just as quickly. Other types of divewear insulation may not be as responsive in this regard. For fleece, this makes a positive of a negative attribute....
Another nice thing is that perspiration can be dried quickly between dives.
And laundering of fleece is very easy.
On the negative side, the lower efficiency of fleece requires thicker amounts and can make for relatively larger weight requirements than some diving-specific undergarments.
Consequently, for temps lower than 45F, I use polypropylene long underwear and Weezle Extreme Plus. That combination protects me very well down to the low 30's F.
If you want to try to use primarily diving-specific insulation, I'd say look for a temp rating of about 50-65F (not 35 to 50). You can always add an extra wicking layer or vest or chest pad as needed.
I have a buddy who often is "roasting" in his Thinsulate 400 in 45F water! (Rated for 35 to 50.) His only option is to let cold water into his gloves and hood at that point....
That wouldn't be my favorite way to "match the temps"....
Dave C