If you're going to get a mod, the area to skimp is not the batteries. You'll want AW IMRs, probably in 13500 or 18650 (small/big) or both if you get one that can use either/or (like the SVD) and a good reliable charger (Pila, Xtar and Nitecore all put out solid chargers).
There are other form-factors, of course, but the two I mentioned are the most common I've seen. I have also used Efest IMRs before with success so those are also acceptable in lieu of AW, but AW seems to be the gold standard in these parts in terms of reliability and general quality while Efest is a newer brand that hasn't yet gotten a huge reputation one way or the other yet as far as I can tell. Avoid anything with "fire" in the name.
Ultimately in your quest for a new PV it's going to come down to what features you want, how much you're willing to pay for it, and maybe personal aesthetics as well. I think my SVD looks awesome, some people think it's ugly. Find something you like (just remember that form follows function).