DIY kits
Boards
Ubiquity Networks RouterStation Pro. Netgate sells a nice board, enclosure, and power supply kit.
Radios
Ubiquity Networks SR71-A. mini-PCI dual-band 802.11abgn card. Uses Atheros AR9160 radio.
SparkLAN has a good selection of mini-PCI and mini-PCIe radios, with Atheros and Realtek radios. Recommended from OpenWrt forum.
