Usually we start with NPM, then move to SAM, NCM, UDT, WPM, etc. NPM and SAM are usually the largest installs, and take the longest to configure, so getting those out of the way helps speed things up. Mostly though, it's going to depend on what modules you have. If you have a multi-poller enviroment, then install all the modules you own from the Orion suite on all of them to enable better load balancing (with the exception of IPAM, it only runs from the main poller).
Regards,
Matthew Harvey
Loop1 Systems