Under the assumption that the listed price reflect's ASUS's true price upon launch and that converted cost is roughly accurate (within £20 pounds or so), ~£500 is still a large figure. It's higher than historical launch prices, even on top of the line GPUs, which is the basis for arguments such as my own cliaming that it will need to be excessively powerful as well to balance that. Not saying it can't be, just that it will have to be. The reasoning of buying a card based on one's level of money is sound, but often doesn't apply to top end cards like these. The buyers who would seriously consider a card such as this are likely buying for a certain level of performance, and will then choose the cheapest option to meet that level. When the costs of all options at that level become disproportionately high people get a bit uneasy, expect some hate and discontent if this GTX580 price is true and AMD releases cards at similarly high ones. For the scaling of SLI and CF, both have greatly improved over the years. The GTX4xx series has recently shown excellent SLI scaling, which is where we get the rush of 2xGTX460s coming from. I haven't followed CF scaling as closely, this review shows it hitting 100% scaling when pushed hard enough. For the support of each of them? That I'm not terribly well versed on and it's really more of a person to person basis. There aren't too many help threads on this forum lately for either one so I'd assume they're both decent, though the 5970 specifically has given some people BIOS grief.