Don't forget to check the front inner and outer track rod ends.
You should also be sure the rear track rod rose joint end bearings have no play. (inner and outer)
Toyota don't service those, but I believe Road and Track have replacements if you need them, and they also stock replacement front rod ends, ball joints and wheel bearings as well.
ARB links can vary in length depending on what coilovers you get, so buy your coilovers first.
But if keeping the stock struts, for OEM link replacements check out:
http://www.ebay.com/itm/New-Front-Drop-Link-Anti-Roll-Bar-Toyota-mr2-SW20-Delphi-PAIR-/200916068981I found these to similar quality to the later model stock OEM items, but a lot cheaper.
A common mod is to fit a Whiteline 20 mm front bar for quicker turn in, but make sure you also fit the ARB mounting reo plates. Many consider updating the rear bar unnecessary.