As a former owner of a 7800GT SLI setup for few days i will say SLI sucks... For simple reasones...
Not 100% compatabile with all games...
Heating issues(With 7800GTX it heats up even more)
Power Hungry(There isnt a decent power supply Available in india to run two overclocked high end cards + Overclocked CPU)
Need 100% same GPU's(Unlike Crossfire)
Not to Mention Expensive
Infact i had started a debate a long time back why go sli... Will try to put up a link for that... The only reasone one should go SLI mobo is when one is buying a mid end card so that he can buy another card when it is available for cheap later... If one is going for a outright purchase with no budget constraints then he should go in for as fast a card as he can and not think about SLI... SLI practically offers 150% performance and not 180% as claimed by nVIDIA or 200% as it may feel like...
As for NEO 4 Sli Platinum its a crap board and i will repeat it again as it cant overclock for peanuts... A better buy would be ASUS SLI Premium or if you really wanna buy a overclocker friendly board then look no further then a DFI Expert and if you are not into overclocking but want the cream of the class then go in for ASUS A8N 32 SLI
So in this order
A8N 32SLI(Not a great overclocker but is a class apart)
DFI Expert(Just about nothing wrong about it except for the northbridge cooling)
ASUS A8N SLI Premium Again a great board but you can have better options
And for the enthusisasts who like to live on the edge and want cheap thrills then a DFI Ultra D... Can be mooded to a SLI board and again just about perfect for insane overclocking...