Pretty much the same advice here. HP100s/X7-100s are comparatively light and with aluminum BP, wing, tanks, can light a couple fift bags a reel and regs the all up weight will be around 105-110 pounds. That's enough to bring up a pitching boat ladder in 6 ft seas.
LP 95s make good tanks in cave country where the cave fill makes them 130s but they will add another 10 pounds to the all up weight if you have Faber 95's and they will add a 20 more pounds if you go with worthington or PST 95's, and at that point you just as well be diving X8-130s.
LP 104/108s are nice for very long dives as they offer maximum back gas with a cave fill, but frankly for day to dave cave diving, I'd rather have 95s and bring along an extra stage as they are big heavy honkers.
As noted, HP 100s/X7-100s are great offshore tanks with enough gas for 25-30 minute dives in the 170-200 ft range with a decent SAC and you can always bring a stage to add another 72-77 cu ft on bigger dives. An AL 72 or Al 80 will add another 39-43 pounds with full tank, reg and stage strap, but you only carry that on the few dives where you need the extra gas rather than dragging another 20 pounds along on every dive.
As Lynn notes, double AL80s are good starter doubles - they are cheap, stable and for most people offer enough gas for 25 minute dives in the 150' range. When you out grow them you will still be abel to use them for a stage and a travel gas/30-36% deco bottle for deeper dives.
Tanks to probably avoid are X7-120s as they are fairly long and do not trim well for many people. At 6' they may work for you, but the number of potential customers if you decide to sell them is much more limited.
