New 27" or 30" Monitor.

Digital lists the ASUS 27" PB 278Q for $629. This leads to a few questions.

1. Does a 27" monitor give better crispness, colors or speed than a 30" monitor of equal quality or is the reason to go 27" more a consideration of footprint and cost?

2. Is the ASUS the best quality for that type of monitor or is a Dell or another brand better? A year or so ago a Dell was considered slightly better for an extra $100. I keep monitors almost forever so I'd rather pay more and get a better one. Even from Dell whose customer service I dislike intensely.

3. Is there a benefit to buying the ASUS through DS when Amazon and others show it for less money? My last monitor I was told by the company salesperson quite frankly that they offered it as a convenience but it was a crappy value and there was no advantage to getting it from them (this was Falcon not DS but I suspect both companies work the same way).

4. NVidia has announced a new V-SYNC adaptation in conjunction with ASUS. I have no idea if it is mostly puff or if it will have a real impact on visual quality or what monitors it will be available for. Is it worth waiting until early next year for as distinct from getting the 278Q now? Is it expected to be enough of an upgrade that if I buy now I should get the ASUS not a Dell or other brand in hope that they will have an upgrade kit for their own monitors?

Thanks.