Microsoft Server O/S recommendation for Chirotouch Practice Management Software

I have a client (a chiropractic office) that is running Chirotouch Practice Management Software, www.chirotouch.com.  They are currently running ChiroTouch on a P2P network with the database residing on the Front Desk computer, which is the most heavily used computer.  They are experiencing slowdowns and lockups since they migrated to ChiroTouch.  They have 12 users currently, soon to be 15 with the addition of 3 iPads, and within the next 3 years will add 3 more desktops for a total of 18.   Chirotouch tech support says they need to go to a Server/Client setup, but they are not of much help in recommending what Server O/S to go with.   The Chirotouch software requires SQL.  I'm leaning towards SBS 2011 Essentials with SBS 2011 PAO since it's the least expensive option.  The client is a relatively small business and we'd like to keep the cost down.  They do not have a dedicated IT person on staff.  They do not need Exchange nor SharePoint.  The only other software they run is Word & Excel & 2 computers run Outlook for POP email.  They have a few shared printers, and don't need remote access.

I'm looking for some expert advice on this.  Is there a reason that the client should pay more to go with SBS 2011 Standard or Server 2008 Standard vs. SBS 2011 Essentials?  I've done the cost breakdown for 15 users:
SBS Essentials w/SBS 2011 PAO 15 cals=$3063.
SBS 2011 Standard w/SQL PAO 15 cals each=$4336
Server 2008 Std w/SQL 15 cals each=$4589

I don't have a lot of Server experience, I'd like to keep this as simple as possible and the cost down, but I want it to run well for the client.  I'd like to figure out what O/S makes sense first, and then I can work out what hardware configuration would be suitable.
riebeseAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Based on what you describe this is exactly the soluton i'd offer.i see no reason they should go to sbs standard unless you expect them to grow to more than 25 users in the next 3-4 years. And essentils offers client backup that will make backup of machines that may control medical devices much easier.
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riebeseAuthor Commented:
Thank you!  I appreciate your help and I'm going to move forward with recommending Essentials.
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Microsoft Server OS

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