Always look down the road and at the *big* picture. While I agree you can get a router and hang it off your DSL/CABLE line, and thats great.. I dont recommend it. It's a real pain when you are learning something new and whack the router.. then find out you need a new image/document/help file and there is NO internet connection since the router is now whacked.
I run a used but effective WebRamp firewall( used to be a high end SOHO router/firewall) which I paid under 60 for on Ebay. This is ALWAYS on.. there are 4 switch ports on the back.. one goes the 2514 which firewalls off my LAN.. one goes to a cheap hub and I have a 501-CS terminal server on that poor mans DMZ for access to my rack either on the road or from the LAN. I use gotomypc.com to get desktop access via the web and I use X-10 modules to control all the routers/switches on the rack from either a handheld or the PC.
On the cable router( I have a 900 series), there is a PIX 501 on the DHCP served side right now as part of my security lab.
Not bad for a single IP address and 5 DHCP private IPs from the cable company. I have 2 labs, a protected LAN and everything is firewalled. There is very little I can screw up and not still get out to retrive files or documents or ???
With regard to 1600s vs 2500s..
For CCNA go price.. BUT!!!! remember that the 1600s are cheap, the cards (WICs) are not. You will pay more for a 1600 with a single serial and then buy the WIC for another.. then you will for a 4 serialk port/2 serial port 2500 series. The 1600s do not have an AUX port which is important for back to back failover links in the lab, DDR, modems etc.
Just my opinions.. your milage WILL vary
MikeS
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"Take advantage of the enemy's unreadiness, make your way by unexpected routes, and attack unguarded spots."
Sun Tzu