As above, very good advice.
As said if you think you will want to go further get a 3d system, or if happy with stage3 then chip/set up would be cheaper.
I like Emerald systems, and usefully it is right on my doorstep.
A consideration might also be that certain makes stop giving help when the next version comes along!!, not so Emerald, all upgrades available free to download to existing systems.
The other major difference is should you get a problem, you speak to the people who DESIGNED THE SYSTEM, so of course know it inside out, not communicating through a third party ever.
They also have a lot of unique features too.
tabetha