Might as well go with SBS 2011. It's about the same as SBS 2008 except it has the newer versions of the software. E.g. Sharepoint 2010, Exchange 2010, built on Server 2008 R2.
SBS 2011 Premium is an addon to SBS 2011 Standard ($750-1000, dependent upon whether you want Software Assurance). You do not need to buy the premium addon right off the bat. ($1200-2000 *for the addon*, dependent upon whether you want Software Assurance).
Given that SBS 2008 Premium is about $1500-2000, you may want to go with that, should you need the full powered SQL server and the additional Server 2008 included. Buying standard and the premium addon would be about $2000, while going with SBS 2008 Premium would be 400 bucks cheaper.
Personally, I would just go with the SBS 2011 Standard (which I already did lol) and upgrade if necessary in the future. As James NT pointed out, SQL Server isn't really stressed by Amazing Charts.
The same benefits Bert mentioned carry over to SBS 2011 Standard.
For SBS 2011, I would say 12-16GB should suffice. 8GB minimum. Exchange like SQL server loves to grab any free memory. Does it need to? No, but if you have free RAM it'll use it like SQL server.
Perhaps Bert could spec a server for you? My spec involves parts that Dell doesn't sell yet. The Sandy Bridge LGA 1155 processors like the E3-1275.
All the Dell Servers use LGA 1366 which is to be phased out by the end of this year for LGA 2011. (Info overload, I know). Mine involves building on your own/getting someone to build it for you. Don't get me wrong the LGA 1366 provide sufficient performance but the top of the line Xeon is about as good as the top of the line SandyBridge (except the SandyBridge is way cheaper, $1000+ vs $300).
CPU: Intel LGA 1155 Xeon E3-1235 3.2 GHz
HDD: 4X Western Digital RE4 500GB in RAID 10
RAID Card: 3ware 9650SE-4LPML RAID Card
PSU: Silverstone ST500GF 500W 80 Plus Silver Redundant
Mobo: SUPERMICRO MBD-X9SCA-F-O LGA 1155
RAM: Crucial 16GB (4 x 4GB) ECC Unbuffered DDR3 1333 (PC3 10600)
Case: Ark SR-801BB E-ATX
GPU: Matrox G200ew Integrated
Optical Drive: Asus DVDRW
OS: Windows Small Business Server 2011 Standard
Fax: Mainpine IQ Express Fax Modem
http://s278.photobucket.com/albums/kk94/sandeepluthra/Server%20Build/Total Cost: $2500-3000 after all the SSL certificates and domain names. (5 years)
EDIT:
Two nonessential costly parts were the fax modem which was $400 and the redundant power supply which cost $500. Just removing these two parts drops the price by $1000 almost. If you use UpDox, you have no need for the fax modem. A quality power supply should suffice in place of a redundant one.
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