Well, your in luck!!! We just purchased tonite or ordered I should say the SA euphoria. I have been researching hot tubs for quite a while and it came down to two, and we decided on the SA model. Not a whole lot of difference but here is what I gathered. The regular one is a 130 and a 160 pump where the SA are 2 160's. The regular has the whirlpool feature the SA does not. The SA has the different jets below the filters. There are more HK40 jets in the SA(these are pretty powerful thereapy jets). I am pretty sure the shell design is the same, so they should technically FEEL the same but maybe not?? I am sure either one is fine, maybe the price would make a difference, for us it turned out to only be like less than 100 for the SA. We decided the extra pump size and we liked the extra HK40s. I hope this helps you and we are pretty excited about getting our tub, I am so...........relieved to have gotten this decision out of the way. Let me know if I can be of anymore help, GOOD LUCK
Kay