While I'm not allowed to make direct product reccomendations, I will say this:
Avoid anything made by Asus (Linksys, Belkin, or anything you'd get from PC World, BestBuy or Walmart).
It's not designed for the Business/SMB/SME/Enterprise.
Access Point manufacturers (for the entire wireless network) I'd trust are:
- HP Procurve MSM (especially with an Access Controller).
- Cisco Aironet (especially the AIR-CAP3602E-x-K9, although don't forget to order antennas separately)
- Brocade Mobility (based on Motorola hardware, very capable integrated controller, supports 127 clients per AP)
- Cisco Meraki (awesome cloud-based control panel).
- Xirrus (probably the best single AP coverage I've ever seen)
- Aerohive (similar market placement to Meraki).
- Ubiquiti (Similar to Meraki, although the controller is inside your network, and cheaper.)
- Ruckus (very clever multi-access point "beamforming" technology).
All of those support some level of controller-ap relationship, meaning you get centralised management, session hand-off (when your device moves between access point associations).
Yes, Access Points are different to routers, but some wireless routers can function in Access Point only mode.
Although, adhering strongly to the Unix Philosophy of "Do one thing, and do it well", you'll find better performance if you have one router, responsible for DHCP and so on, and multiple (of the same brand/model) access points.
If you're going to do wireless in your office, you might as well do it right, and then not have to wonder why your signal drops after 5 devices associate, or you wonder why the speed drops off during some parts of the day.
It's embarrassing for a business to exist in the 21st century, and still have a wireless network held together by consumer-grade boxes, coconut shells and wet string. Having been in the position of both and employee and a visitor, watching someone go and reboot the access point in order to allow another laptop to connect isn't only embarrassing, but potentially damaging to your business.
There's a massive difference in configurability, feature sets and performance between the consumer, off-the-shelf black boxes from Asus or Linksys et al. that you get at BestBuy, compared to a wireless solution from a business-oriented vendor.