You should use the AP from the same manufacture for your current deployment and in you current deployment i would recommend that you use a cable setup rather then following the wireless solution as the distance is not far.
Following are the required answers to the query 1.Always use the same vendor equipment to act as Repiter/Bridge 2.Cisco 1600/2600/3600 series AP is an optimal solution 3.It is recommended that you use 3600 AP (but is depends upon the type of application used by clients and number of users).Also you did not specify the devices models so that a suggestion about the network desgn can be provides and link usage of the clients. 4.well the newer AP have better through put and upcumming standared such as 802.1 ac is slowing becoming the replacement for the wired so the quality will depends on the data usage.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...