i hear the lack-o-funds part... that's why my engine swap took 5 months!
as for the LS2/3, i do believe it's a more-involved swap, but it's doable.
AWD - i've thought about it... & then i stopped thinking. it'd be much more trouble than it's worth considering mine's the NP241 (the manual version without the wiring harness & the second hole in the floor), and it wouldn't be as good off-road. then you get into lowering, stiffer suspension, better wheels/tires, turbo, bigger brakes, bigger engine, etc...
...but an AWD 5 speed would be pretty freakin sick!!