To upgrade from Simaudio 600I to 740p/860a combo?

I had the 600i v1 and loved it.   After getting new speakers I upgraded to  a Pass X250.8 and SimAudio 740P combo and it was a big step up from the 600i to my ears.   I tried various preamps with the Pass amp and it wasn't until I tried the 740P that I felt the combo took a big jump up over the 600i.      Assuming the 860a (and now v2) is equal or better than the Pass than I would imagine the 860a v2 + 740P would be a killer combo if you like the SimAudio sound signature (as I do).

The 700i V2 will be on my integrated list if I ever consolidate back to a higher end integrated...

Yes you should definitely do that it will be much much better.

@ddafoe I now have a Pass 250.8 and love it. I am running my Lumin T3 directly into it. It is good, but not great at is was when I tested in going into an INT250. The preamp in the INT improved the soundstage and natural sound. 
I am considering the Moon 740p for the pre into my Pass. Are you still enjoying the combo. What do you like about it? 
thanks!

@jo1mtb, I still have the 740P but have moved from the X250.8 to the XA30.8 to now the Coda S5.5.    I've tried a few very good quality DACs (e.g. Meitner, Bricasti) direct into the various amps I've owned but have always preferred the sound of my system with the 740P present.    I find it may give up a slight level of detail compared to DAC direct but adds a more fuller and 3d like soundstage which to me makes the music sound more life like and enjoyable.