Glad to hear everything is working. Yea, SBS Essentials tries to fit in that middle ground, but unless you're using one of their certified routers, things get lost in translation. Of course you could always just setup DHCP on the Server, but they thought that was too complex. There's a video tutorial if you wish to go that route however.
These are some of the ones they recommend:
Linksys BEFSR41
Netgear RP614
Sonicwall TZ170
Sonicwall TZ100
D-Link DIR-825
Linksys WRT160N
Linksys WRT54GL
Watchguard Firebox X20e
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