I purchased and returned the Samsung S27A750D recently. The experience was ok with a nvidia gpu and 3D TV Play. I used 1080p24 but had to leave v-sync off, so then with the tearing, it was disruptive to the 3D experience. After a week of normal use, the unit began to buzz quite loudly from the rear area of the screen (its psu). It always occurred when there were pauses to the signal from the pc, like when rebooting. The picture quality was the absolute best I had ever seen, and only recently matched when I purchased a Samsung LED tv (pretty much the same just bigger, and 120hz).
If you read through the comments really fast while watching the movie, "The Fighter", Cleeve kinda morphs into Mickey Ward, taking some shots from the 3D/HDMI/DVI-D Police, but defending them like a champ.
Anyway, I guess you want to prioritize. Blu-Ray 3D should be a reliable experience, so focus on that, if you are interested. Then, from there, consider any other 3D experiences like gaming, or cable broadcasts (HBO on demand for instance), as a bonus, plan accordingly, and make the right purchases.
If you really like the idea of using a 120hz monitor, then focus on the benefits of using it for any type of 2D use, and then if that peeks your interest, go for it, and just keep it in the back of your mind that you'll also benefit from the hardware when using the 3D.
I've been complaining to myself (honestly, who else would listen, right?), and I have a lot of eye fatigue from the 1080p 60hz monitor I have been using for a few years. I am now experimenting with the 27" Acer 3D capable 120hz monitor. I first want to use the 120hz feature for about a week and see what effect, if any, it has on eye fatigue. I'm going to try to hold off the urge to load up 3D games as long as possible to soak up the 120hz-goodness. Already, it reminds me of waking up to a crisp and bright summer morning.