I think the Agilent Genesys is the best value for RF software. It is a good balance of full-feature and reasonable price (although not as reasonable as it used to be!)
Microwave Office of course! I bought Eagleware (aka Genesys) in '92 when it came on four 5-1/4 floppies. This was my personal copy, which I later traded in for the basic version of Microwave Office. The base version has linear simulation and layout, of course you can scale it up to handle MMIC and RFIC. I have the full Analog Office and VSS at work though.
From my experience: MWO.
I have version 5.51 (released in 2002.) and i am pretty satisfied.
There are some bugs (like in every other program), but as i saw many of them are corrected in version 6.51.