However, if you would like to have a VNA I recommend one that has integrated test set like 8753D (it also comes without test set) It also has a 6GHz option? which would be fantastic.
The external test set does offer some advantages, which is why I bought an 8753ES option 011 (external test test). Testing high power amplifiers is one obvious one. Almost all current high end VNAs have an extra-cost option of a configurable test set.?