Welcome to TCCoA!
Your best bet is to search on here and research all the different options vs applications.
I personally like the 1 3/8 F/R, but the majority of my driving is highway. I think the general concensus is the 1 1/4 F/R is the best overall setup.
It depends on what exacly you're looking for.
Be advised that swapping out the front sway bar is "involved".
But again, just a tip, please search on here and read the tech articles before asking this type of question.
97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!!
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine