I'm partial to HP and had an 8596E. The 94E, I believe is a two band unit (transparent to the user). Be sure to check it over its full frequency range. This series also has many options and you can pick up some of them on ebay if you wait (and you need them). I had very low RBW, fast acquisition, fast horizontal sweep and am/fm decode. Most of the time, I dumped plots in a few seconds each over GPIB and the excellent (and free) GPIB toolbox from KE5FX.com. The kit has a 7470 plotter emulator which is fast and flexible, lets you do overlays, change scaling and colors.
We have an R&S FS300 at work and the UI is terrible. The model you're looking at has a very different layout and may be ok.
If you need work done on either older unit, check for 3rd party service accessible to you. For me in the US, I look at our little R&S as an orphan.
For pre-compliance, a quasi-peak detector is handy but not essential. You'll need a decent preamp (unless the R&S has one). The HP also has very quick storage of setups in 10 locations. Very handy for popping back and forth between different EMC setups (i.e. antenna, near field probes, different bands of interest, etc.). Programming of limit lines (FCC, ETSI, etc.) is easy.
The HP is a nice size but you can count it as part of your weekly exersize if going mobile. The green CRT is nice if in good shape. New CRTs pop up on ebay and there are now also LCD replacement kits (good but not cheap).
added - if the R&S USB and file system is anything like the FS300, you will want to tear your eyes out after using it for a short time (IMHO)