1)as far as i kno, cusco makes the front tiebar, and tanabe makes the rear tiebar.
the tie bars increase the rigidity like the upper strut bars. performance gains w/ the tie bars will not be as noticable w/ new aftermarket sway bars.
sway bars will reduce the amount of roll when you make sharp turns. imo, get the TRD
2)the front upper strut bar and rear strut bar both do the same thing, stiffen up the chassis to aid in cornering. most ppl get the front strut bar first, and then the rear. it doesn't really matter which one you get first