I saw news about Octane for 3dsmax, so it become really interesting for me, as I usually using only 3dsmax, without external renders.
I will try to wait for DEMO version of Octane for 3dsmax, to see, will I able to use it for my tasks. And I hope I will

Q1: Here is first question - If I will buy Octane 3dsmax bundle (just don't want to wait for DEMO), and if I will not like it, will I able to get refund?
So if all will be good, I will need to upgrade my GTX260 to something bigger and powerful for Octane.
I have: AsRock Z68 Extreme7, i7-2600K OC 4,4Ghz, 16Gb RAM, Antec CP-1000W and Antec Twelve Hundred case. Also 4 LCD screens connected, 19"-40". And there will be 5 in nearest future.
I want to buy two powerful video cards and maybe one more card for additional LCD screens connection.
Q2: What is better - put two cards separately, or put them into SLI? Or it have no difference for Octane?
I can try to put x3 cards inside, but then there can be problems with temperature and power. So lets look for x2 v-cards combinations.
As I think, better way for me, my PC, and for performance is to use x2 GTX590.
Q3: Can somebody tell me, how x2 GTX590 will increase Octane performance, depends my GTX260? (it give me 4,6Ms/sec, and 38mins (16000) render time in 2.46b DEMO Benchmark scene, with that gray boxes inside)
I hope my power supply will be able to give enough energy for x2 GTX590. If not, I will upgrade it too, or put separate PwrS nearby.
My tasks are pretty different - from architectural visualization and medical animation, to cartoon animation. So what about video card memory? Are 1,5Gb will be enough for any task, or I will not able to render some scenes because of low memory?
Q4: Whats better - put x2 GTX590, with 3Gb memory per card (1,5Gb per graphic chip, as I understand), or put x1 GTX580 with 3Gb + x1 GTX590? Maybe even x1 GTX550Ti 3Gb + x2 GTX590?
And for a last:
Q5: Are Octane able to use stereo-cameras/stereo-rigs for getting horizontal-stacked stereo images? Or I will need to put two cameras, and render them separately?
Thats all. I hope your answers on my questions will be interesting for other 3dsmax users, that looking for power of Octane Render

Thank you very much!
PS: please help me to decide by choosing one of x2 GTX5xx combination

x2 GTX590, 1,5Gb per chip, 13,5Ms/sec. benchmark
OR
x2 GTX580, 3Gb per chip, 8,28Ms/sec. benchmark