If you want to be cost effective and since the server will be mainly used for "shares", you don't need "that much" power. So shop around for a good price for buck server. You won't need the latest greatest dual quad and 32 gigs of RAM (from what you are saying).
What you should consider for your server, in my opinion, is scalability. You probably want to go with a Tower, more than a blade. The reaon I say this, is because you will have more "room" in your tower for example, for additional storage.
Maybe get them to invest in a "non-expensive" Raid controller card.
Personally, for a server for this tupe of outfit, I would build sosmething along the lines of:
- 2 1 or 1.5 TB Hard drives (Mirrored for fault tolerance).
- Raid controller card (on-board is usually not so great).
- 3 or preferably 5 cheap ($ wise) HDDs. Maybe 750 GB or 1TB (you can go even smaller, 250GB since your needs are small). This would be, again for fault tolerance and inexpensive backups in a centralized location. Also, with a raid store, less likely for someone to walk away with the External Drive.
- Server 2003 and Server 2008 both offer good print server alternatives. Just ensure you are using compatible drivers for your clients. All drivers for x32 and x64 clients of almost all OS's should be easily and readily available.
- PAPERCUT software is a free print monitoring software, with quotas etc. for 5 users and should do exactly what you need.
- I would also go with a NIC in the tower that has teaming capabilities. 2, 1 GB interfaces for twice the output and redundancy. Might save you a phone call or two one day.
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For printers, again, shop around. Sounds like you need quality and speed.
- Some printers offer both, but replacement cartridges can be steep, especially for color. Look at PPS (pages per second) and dual sided? if necessary. More importantly, total cost of ownership, I.E. How many pages before replacing: belts, drums and toners. Cost of toner can be a deal breaker.
- Black and white, if speed is not an issue for printing text, cost and cost of toner. There are some good multis out there. Brother makes some decent, scanner, fax, printer (black and whites). Toner not too expensive and reliable.
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Wireless is always an issue. Cisco Valet is more a home use Router. There are some out there with "more power/coverage" per dollar. Although Cisco should be reliable, shop around. Personally, I like the ASUS RT-N 16. Lots of power. There are "alternative firmwares" that allow this to be a powerful Enterprise wireless device for the price of a home wireless system. I.E. Tomato, DD-WRT, etc. Some research required.
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Plan for expansion: Maybe a 24 port managed switch insstead of 12. Run some extra cables if you can, to or near the workstations. Identify the wiring and make sure you have a wiring diagram.
You likely will not need a Router, unless you intend to link to your "home office" with a dedicated line, VPN for example. A firewall would be good as well. Some firewalls can even provide you with a dedicated VPN to the home office (if necessary).
Verify your cable runs. Will you need patch panels?
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Ideally, if you are going to go with Windows Server 2003 or Server 2008, I think you should go with an Active Directory for centralized management. Create some restriceted "visitor" accounts - could be generic. This will allow you to better setup your shares and offer more security.
Hope that helps. Hope others answer as well.