GNS-5xx OR Radio-Plus-Autopilot

I am considering the following:

.

A set of Saitek, Radio-Panel-PZ69 and Multi-Panel-PZ70 for $304,
OR
VRInsight GPS-5 for $400, or
EmuTeq GarSim GNS-530 for £465

.

Is there enough overlap in features / functionality that I can get just a GNS-5xx
or would I still need to get a radio and autopilot? 

.

I anticipate using  them for hopping to the next VOR beacon and to the next airport,
and autopilot to hold bearing and altitude while I look around and figure out where to go next. 

.

Would I promptly outgrow just a GNS-5xx and want a radio to talk to people (like VATSIM)?

.

Thanks in advance,

JD