Joe...GSpre is out as is the GS-150. Some people have commented on other fora that it's not the equal of the Ref 5SE line stage but you are getting a phono stage in addition. Plus the extra dollars also go towards the "upgraded" aesthetic if you like that look.
I personally would still go with Ref 5SE and a stand-alone Ref Phono 2SE if the budget and rack space allows. I think SQ-wise, those two will beat the GSPre from the commentary I have read. I have seen a review or two of the GS-150 (and I think one of them also reviewed the GSPre). I will try to find it and post in this thread.
Keep in mind this is just based on what I have read and I have not personally heard the unit. The Ref 5SE and Ref 2SE I have heard in group demo situations and I am a big fan but there has been plenty written on both.