My Donek Experience started on a Proteus 170 and that was a nice board, it was probably a little too stiff for me, but I made it work. Lots of tail pop out of that and it certainly was an entertaining board, but it was a one trick ride. The versatility for me was not present with this board.
Then I found a 2013 Carbon Rev 185 (100% experimental build) 14-20 side-cut on the Donek preseason/demo sale and that was an AWESOME board for the first runs of the day when nobody was around. TONS of edge hold and amazing turns if you had the speed and real estate. I ended up riding with most of the weight on the nose since it would just accelerate down hill if I didn't. I sold it to a local snowboard racing coach because it was too big to fit into my snowboard bag while traveling.
Which brought me to the next board, a 2013 Metal FC 175 11.5-13.5 side-cut off the shelf board which was amazing. I'd still have it today if I didn't win a Coiler at SES 2015. The FC has nice turn shapes, damp, composed, crud busting, beautiful gloss top sheet. No bad things to say about the square tail FCs, it seems that the turn shape was just right for me, I preferred riding that board and rode it as much as I could. In fact I modeled my custom Coiler Nirvana very much after the Metal FC.
I also had a 2013 160 Glass Saber - super awesome board for soft booting, I sold it due to being more into hard boots and not seeing Ryan Knapton's riding soon enough and really understanding binding set up.
At ATC, I rode my F2 Silberpfeil 163 the most, which leads me to believe that I would really like the Legacy. I really wished I tried out the Legacy and the Rev 163. I've heard nothing but good comments for both. When I asked about the Rev 163, I heard a lot of "quiver killer". Big open runs, tight trails, low traffic, high traffic: grab the Rev 163 and ride all day.
I know what you are going through, I had the same feeling last year. I hope you are able to decide on a board and get some turns in this year on your new board. Congrats!