I will make some assumptions here, correct me if I am wrong.
1. You are on AT&T DSL, either Xtreme 6.0 Mbps or Xtreme 3.0 Mbps.
2. You experience congestion problems when several people use the internet at the same time.
3. You read that 802.11n wireless routers are faster than 802.11g routers.
The 802.11g capability of the 2Wire 2701HG-B is a theoretical 54Mbps. That would be 9 times the data rate of a Xtreme 6.0 connection. In the real world a 802.11g wireless router delivers a solid 13.5Mbps which would be twice the data rate of a Xtreme 6.0 connection or 4 times the data rate of a Xtreme 3.0 connection. The limitation on your internet access is due to the limits of DSL, not your wireless router.
Now, if you are experiencing limits within your network, such as transferring files to a printer by WiFi, or streaming video from a media storage device, than an upgraded 802.11n wireless router can help, if all the client devices(laptops, tablets, phones, printers, WiFi adapters, etc) are 802.11n also.
The 2701HG-B is a combination modem and router. The modem takes the DSL signal and converts it into a data signal a computer or router can use.
A big problem with AT&T DSL is the temperamental behavior it exhibits with different modems. Going outside the officially supported modems for a particular region can mean constant resets. So in that case you would be stuck getting the Motorola DSL Modem Model 3360 for $75 »www.att.com/equipment/accessory- ··· q_model=
For wireless routers to use with that modem I have had a good experience with the new E series routers from Linksys. I have used the E4200 for maximum signal range, but it can be costly at about $180. The E2500 and E3200 offer less range and features, but cost less, about $100 for E2500 and $160 for E3200. I have also used the Vizio XWR100 »www.vizio.com/accessories/xwr100 ··· ing.html
very successfully. It costs about $70.
As you can see, the separation of the modem and router lead to a higher cost than going with the $100 gateways AT&T offers.
PACE 4111N »www.att.com/equipment/accessory- ··· q_model=
Netgear 7550 »www.att.com/equipment/accessory- ··· q_model=
Which one to get? I would try the Pace first.