Cisco vs. Proxim for Enterprise AP?

We've had solid performance from our older Cisco 350 AP's and we've since
tried some AP's from Linksys and they just are not of the same level of
quality. My vendor has recommended the following and I'd appreciate your
comments if you have experience with these models. I've heard good things
about proxim but I'd feel better knowing what makes them better than Cisco.

Proxim ORiNOCO AP-700 $329
Proxim ORiNOCO AP-4000 @ $475
Cisco Aironet 1100 @ $421
Cisco Aironet 1231 Wireless access point @ $623

Thanks,
-Bob