Reku
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Glad to see people love lp85's as much as I do! - heck even in the north I can get a semi cave fill to at least 3200-3400.
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Lots of suggestions here.
My recommendation would be based in part on your size. Taller people tend to prefer longer tanks and feel that they trim out better. Shorter people seem to prefer more compact tanks. There are plenty of links to tank charts on the internet to compare. Of course, you should also consider the kinds of diving you're going to do and whether you're going to try and match with any buddies for planning purposes.
I'm 6'3" and have a set of LP85s and a set of HP130s. Both are longer tanks, which seem to suit me well. And getting a cave fill on a set of LP85s can let you do some decent dives.
People often end up with several sets of doubles because different dives call for different tools.
I've been doing the dive planning for my AN/DP checkout dives. My instructor told me to plan 2 dives, on successive days. Both to 120' for 35 minutes. I'll be using double HP120s and an AL40 for deco gas.
After going through this exercise, I am very glad I did not get doubles that are any smaller.
. . .
I haven't had any tech training (yet), but from what I understand, stage bottles can be employed in some scenarios--perhaps more readily in cave diving than ocean diving--to alleviate the need for larger tanks. So, we divers of modest stature may be able to get away with smaller doubles for cave diving. I have a set of backmount LP 85s that I am trying to learn to manage. I'm 5'-8" in height, and I can't imagine humping longer and/or heavier tanks than that on my back. (Yeah yeah sidemount, whatever.)
We have very commonly use stages of bottom gas on trips. If you want to get in 4 deco dives in the 120-160ft range that are hours from the nearest compressor, you can do it with 2 sets of doubles and 4 ali80 stages plus some ali40s of deco gas. Basically we use the bottom stage completely plus a small amount of gas from the doubles, repeat for dive 2. At the end of day 1 you have a set of doubles that are 1/2 to 2/3rds full and 2 empty stages. Switch to the second set of doubles and repeat for dives 3 and 4.I haven't had any tech training (yet), but from what I understand, stage bottles can be employed in some scenarios--perhaps more readily in cave diving than ocean diving--to alleviate the need for larger tanks. So, we divers of modest stature may be able to get away with smaller doubles for cave diving. I have a set of backmount LP 85s that I am trying to learn to manage. I'm 5'-8" in height, and I can't imagine humping longer and/or heavier tanks than that on my back. (Yeah yeah sidemount, whatever.)