Personally, I'd go for the 2 inch. It causes less problems with stuff like brake lines, fuel lines, etc. The shifters are a little easier to deal with too.
If you get a kit it should come with most everything you need, bolts spacers, and so forth. Whichever one you go with, go slow and look for parts that are binding up. The fuel lines will get tight, but there is a hold down on the bottom of the cab you can take loose to get some slack. I didn't have much trouble with brake lines, but keep an eye on them.
The only thing the kit might not cover is the shifter boots. You may find you need to enlarge the holes and cover them with generic boots.
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good