Little help with buy strategy of tele lens

Hello,
as you all know Olympus is starting its M.Zuiko Pro line of lenses, which turned into my dilemma. I try to strategize in long-term what to buy as I can't print money .

As title says, I'm in need of a tele lens in general and definitely need one for spring next year. I have 12-35/2.8 and 25/1.4 (both fit my needs) and I plan to buy 35-100/2.8 now, and I don't think I would buy 150/2.8 as extra lens. BUT, thanks to Olympus the planned 40-150/2.8 (scheduled for the end of 2014) is really tempting for me now, thanks to extra range 100-150 at 2.8 in one lens (so lens completely covers my expected tele range), and optical quality may be better than 35-100/2.8. On the other hand, I'm worry about weight and size to GX7, price tag, and a chance that 35-100/2.8 may change in price.

Because of this and the problem that 40-150/2.8 will be here for sale in 2015 with real reviews and tests, I think I postpone 35-100/2.8 and 40-150/2.8 to 2015 and buy 75/1.8 prime instead (which seems to be a superb m43 lens and is in the FL center of 35-100 + it has 58mm filter size as 12-35/2.8 and 35-100/2.8, and I will keep it after I buy a zoom... on the other hand I'm not sure I would buy it when already having the zoom).

To make this strategy more difficult I also plan to buy GX7.
1. I find my GF3 (after more than 2 years starting as a beginner) limiting to my needs... and physically limiting (grip... attaching GF3 with 12-35/2.8 to tripod is almost impossible, which is frustrating, GF3 is too small and the lens "overflows" the body).
2. If I buy 75mm/1.8, in-body stabilization is rather welcome, right? Also, in case I would buy 40-150/2.8 without OIS in the future it may become a need, am I right? I don't have handheld experience with tele focal lengths

Do you think that the following strategy is a good one, or is there a better solution without wasting money?
2013: GX7
2014: 75/1.8
2015: 35-100/2.8 or 40-150/2.8 based on price tag, weight, size, optical quality
Thank you

I think with the GX7 you'd still want stabilised lenses, unless the IS is better than we expect.