Seems like 150, dew shield, reflectix wrap, and covered in the shed makes this a grab and go scope. With more light grasp for fainter doubles, might even put an 8-24 zoom in it and call it an easy ready to go scope. Wait for summer, compare views with the frac, and sell one off!! Appreciate this guys.
I vote for the 150mm, too.
I have the 180mm as my best performing scope, but I don't have a good refractor like yours, which I think would be a good complement to the 150mm mak you get. The 180mm is bulkier, and while still an easy move for me, it needs, as you already know, better mounting. Not grab-n-go for me for sure. Insulated and collimated, it is an excellent scope, that I still use very often. I can imagine myself using a 150mm mak even more often. I was set on the 150mm before a good deal for the 180mm came up.
I have very similar eyepieces to yours, so I sincerely believe you will enjoy the views through the 150mm. The wide AFOVs will be such a benefit of your eyepieces. I wonder if you might be able to use the 30mm as a finder EP, and I think the 13mm will probably begin showing nice views at 138x. The 6.7mm would probably do excellently at 269x when the seeing is good.
Through my mak, I had some of my best views of globulars and M42 details when they were at higher altitudes. Enjoyed every moment even in the cold (nothing compared to the cold where you're at of course, so I can't complain).
Jupiter and Saturn look good at higher powers when seeing is above average. Neptune and Uranus were more distinctly noticeable as planets, and were cooler looking green-blue blurs. I'm looking forward to hearing about your experience with the 150.