look seriously at the 2620, we use them and nortel and the cisco is easier to configure and has less problems.
Some things to think about,
1. you referred to "router thingy" unless you plan to pay a network engineer to set up your network most enterprise class hardware is gonna kick your butt.
2. $100 bucks? you're gonna pay that in nuts, bolts, screws, cable velcros, cat5 etc.
3. 4 users to 24? thats really small enough at this point to hire in a leased solution with setup and support from someone like Dell with very little work and they'll design to your needs and give you expand otf options.
4. fractional T1? you're splitting voice and data? thats crap in todays workplace. you'd be better off finding a premium dsl or if you're urban get a business class cable. they'll give you as many ips as you needs as much bandwidth or site hits as you want, put in a simple router so you have basic firewall and filesharing security. you supply a 100 base t switch, an 8 port'll do you now and can be replaced or expanded at need (i like bay networks or dell, hp is nice too) and you wont have to spend a fortune. plus @ 10 mb connections for $149 a month its probably cheaper than your turn of the 90s fractional costs.
