Sorry for English, I wrote from office...Now I have little bit more time. If you want everything in one box LitePoint IQ2010 is good choice. But support and software can be better. You will able to measure most of the parameters as: power, max power, EVM, CCDF, clock accuracy etc. But you need SDK for chipset to work in non-signaling mode (direct connection, low level commands). Agilent has few devices (for instance N4010) with similar functionality, but support and software are better. If you have WLAN stack and want to test device as black box you choice - Anritsu M8866B(C). Pay attention for small but expensive details - cables, connectors, combiners, LNA's, filters etc. You should not use cheap stuff!!!! it is important.
Good luck.