Re: [thecount] PC question
Depends on your pulling style. Low versus high. a 32" is nasty for sub 8secs. Nice for 8 upwards unless you want low deployments, then move one or 2 sizes up (36" or 42"). Vented is a very valid option, although having a well made PC and attached symmetrically will do fine.
Remember that just because you can go terminal on a wall does not mean you will. Get a PC for your capabilities and not the wall's.
In my experience, a small mesh 36" non vented has a similar drag to a big mesh vented 32". but opening low or high (as opposed to opening at a conservative altitude) I would prefer a bigger PC.
As for sliders, You should really have that dialed in before you jump terminal walls. If that is not possible, then you should really have all 3 sliders and evaluate for the best config and hope the first jumps allow you to evaluate the openings. It really sux if you have to open high so you don't get slammed or so you don't snivell in on a terminal wall. Do your homework and terminal walls can be Disneyland instead of a proving ground.
Hope this helps,
Take care,
space