I would recommend a pair of AP-277s or 377s for easy deployment with the best performance, or you can use an AP-274/374 with an ANT-4x4-5314 directional antenna on each end for maximum performance or for use in high interference areas. If the area is not in a crowded area, and you want to save cost, the AP-367s may be viable as well.
Note this requires completely clear line of sight between the two APs.