Secure Wireless Site to Site Bridge - Aironet 1300 or 1252?

Hi there,
We're planning to connect a building no more than 50m away to our network via wireless (after careful research. The builing will only house 2 people, one requiring just internet and email access for ordering materials, the other will be doing document scanning - currently scanning files of roughly 15Mb every 3-5 minutes to an SQL server in the main building. They will also need to retrieve similarly sized files from said server within the same timescale. The solution would need to offer WPA2 security and a hidden SSID.
I have been pointed in the direction of the Aironet 1100 which now appears to be discontinued, so the Aironet 1300 was suggested instead. Will this 54g device be sufficient for the activities above and if so, I guess I will just need to configure each unit as a bridge (1 per building?)
I have also been looking into N type devices and found the Aironet 1252 but I believe that this is an internal device? I have the facility to locate it by a window/ very close to the outside of the building on both sites but not sure if this would be cost effective. Am I right in thinking the 1252 would require me to purchase additional antenna to go with it? If so, what type would be suitable as there are several listed on the site.
Finally. I'd like the solution we go with to be expandable (if it allows) as another building within the same area is also being looked at and would benefit from having a similar connection to it. Whether the bridging would allow for this, or another 2 units would need to be purchased is something I am unsure of.
I'd really appreciate some feedback from someone with experience of both units or experience in setting up a similar configuration as I am quite new to this side of wireless
I have included a basic Visio diagram of my proposed configuration; I hope it is of some use.
Thanks in advance.

Hi,
the 1310 will offer sufficient throughput. But if you add buildings, maybe you will start reaching the limit ...
The problem with the 1250 is that it's not meant to go outdoor as it is, apart from that it's perfect for the job.
The type of antennas strongly depend on the location of the building.
If the 3 buildings are in a line with the main building in the center, you will need an omnidirectional antenna. The point is that your bridges should all hear each other, so their coverage zone should include all other bridges. Then it's possible to have one AP at each site, the main site AP being "root" and the other being "non-root". If too hard, you could also go with 2 APs at the central site and then you can go with directionnal antenna toward each building.
And the 1310 can come either with an internal antenna that is very directionnal or with external antennas connector. The 1250 is always for external antennas.
Note also that the 1250 requires a bit more power than normal PoE allows.
I hope this helps,
Regards,
Nicolas
===
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