The 28.6 is the cheapest bar. But you dont want that. One with that bar it will make it easier for the rear tire to left up during hard cornering which in turns gives you less traction. That bar with the stock front would also give you major understeer. The Eibach set is probably the best you can get for handling. 22mm front and 25mm rear.
yeah 25 22 is probably going to be your best option for a daily driver
i'm torn right now between the 25/22 and the 28/24 but i think i'll wind up going with the 22/25 as well since that seems like it would be a bit more forgiving on a daily driver
My recommendation is to get the smallest bar that will do the job. A good handling car is a NEUTRAL handling car and that should be your goal. It DOES NOT REQUIRE a huge bar to do this. Going with a really big rear bar requires a bigger front bar to neutralize the bigger rear bar. Are you getting the picture...its really never ending. Really big sways also require the control arms to be reinforced or they will fail as well as beefier front end links (read more money). If you have a stock front bar and don't wish to replace it (e.g. spend more money than you need too) a modest size rear bar is all that you really need to make the car "neutral". A Progress 22mm bar would do this quite nicely.