Yes I meant to say enable SSID Broadcast. I just found an option on my router to Set for maximum range vs maximum range and speed. I set it for maximum range and the iPad has been solid. I have not tried mixed mode since I will too many other devices to change.
I have a Netgear range max 240, model WPNT834. I know it's a old router but it has been performing for me solid since I had it. It's configure for WPA2, static IP's on LAN side, mode - G only, channel - auto, MAC address filtering and SSID enabled. I have a WII, Blackberry phones, Dell, HP, Toshiba laptops on my network without any problems. I will leave my set up this way since everything seems to be working OK.
I will give this IPAD another chance and try out some public wifi spots to see how it performs. If I have any more wifi issues it's going back to best buy. I have exhausted a lot of time this weekend trying to correct this wifi issue. When I purchased my iPhone 4's they connected like charm.