Well, Linksys routers are good, but NOT because they are owned by Cisco now.
The Linksys wrt54gl has always been an awesome router, since it can be heavily modified and tweaked to your wishes using open source firmware.
I have the opportunity to buy a
CISCO 1200 AIR-AP1231G-E-K9 WIRELESS AP ACCESS POINT
and wonder whether this product would 'blow away' the linksys or whether its original high price is more to do with the metal box and general industrial construction.
I am particularly interested in range.
I doubt it will. The standards in wireless do not make a certain router that much better than others. The transmission power of a linksys is good enough for your average household. The hacked/open source firmware of the Linksys wrt54gl gives a multitude of possibilities (even amplifying signal strenght), but absolutely no warranty. Perhaps your needs are best met with two Linksys routers?
If you are trying to setup a business and require a lot of very trustworthy connections, maybe Cisco is the answer, because of the warranty. Then again i would not recommend a 2nd hand router, but a new one with complete support and warranty package.
Then again, it all depends on your needs and your uptime. If you want an absolute warranty that almost nothing will go wrong, you better get high quality stuff like Cisco. You'll pay for it as well.