The plus model is easier to watercool, the hard drive mounting system and partition is screwed in down below making it easier to fit a rad down there.
If you're putting the rad down below then you're going to have to mount any hard drives in the 5.25 area.
The measurements from front of the case to partition that the PSU sits behind is 288mm, just big enough for some 120x2 rads. Unless you plan on reinforcing this area I recomend keeping that partition in to support the (albeit minimal) weight of the central horizontal divider.
If you're mounting the rad up top you can fit a 120.3 up there so long as you don't run a sound card in the bottom pci slot and drop the optical drive down a few places.
Snapped these quick for you.
I'm going to watercool in the next week or two and plan to put a 120.2 down below.
The v1000 isn't a huge case and I think if you plan on going 1/2 tubing with 120.3 and a big internal res it's going to be tight and take effort/modding.
However it's deffinately well suited to a slightly smaller system as everything will just fit easily. All subjective to the persons needs obviously heh.
Anyway, hope that helps, goodluck mate