I would add fiberglass into the equation if you are truely planning a DIY install. I put one in myself from start to finish including digging the hole and from a DIY perspective fiberglass is probably easier to install that Vinyl IMO.

Fiberglass

Pros
-Some really neat shapes and colors are available out there.
-Virtually indestructable. Should last 25+ years.
-Very limited amount of areas where it could leak.
-Chemical neutrality--it doesn't affect your water
-The digging of the hole does not have to be precise since backfill is utilized.
-Because of above, super duper fast install! Went from dig to backfill to fill in one day.
-Adding lights, returns, anything is a snap.
-Can be tiled just like a gunite pool.
-Very low maintenance.

Cons
-More expensive that vinyl but cheaper than gunite.
-The white shell version can show stains and may need to be cleaned on occassion.
-Can float out of ground similare to gunite if drained.
-Shapes are more limited than gunite.
-Can crack if not properly backfilled.
-May need a crane it get it in your yard/hole.