Portal Products

I am currently evaluating the options available to my company regarding portal server products. As there are many others out there in my shoes, I wanted to ask those experienced in this area what their opinions are as to the best product(s) and whythey are the best. Alot has been said about Microsoft SPS, Brio and Corechange products in recent IT news. How well do other options hold up? Citrix for example. Where’s your money riding?

Mike