The first thing I would decide is auto or manual tranny. That decision takes you in somewhat different directions gearing wise. With the manual, you need to go lower gears to get the same result. Auto's work well in the right combo, but are not the norm, especially in <nobr>Suzuki's
</nobr>. If you decide to stay in the mainstream, I would go as low as possible in the t-case gears right off the bat. You can get 6:1's for about the same price and the high ranges in all the 4.16 to 8:1 cases are so close it isn't worth worrying over. A doubler is a cool idea because it gets you more gearing combinations for different circumstances, but at $1,300 to $2,000 for a doubler, it isn't for the shy or financially challenged (like me [img]images/graemlins/laugh.gif[/img] ).
On the motor upgrade, they are nice but they are spendy. Think about how yours runs, what else you could buy with the money, and how much on-street driving you will do with it (on-street is where I appreciate my 1.6 the most).
The best advice I can give you is get a plan and work at it. Without a plan, you can waste a lot of time and money bouncing around without making much meaningful progress.
I would put the priorities in somewhere around this order:
1. Decide on tranny.
2. Buy some t-case gears.
3. Get the rig lifted onto the Toyota axles.
4. Get rear locker.
5. Look at power steering and a front locker.
That's my $0.02 Good luck.