Offhand, the instrument I'd love to have started out with was the Privia PX-5S.
It is not only a fully weighted hammer action stage piano but also a full blown synth allowing six part layering and four control zones.
For just under a thousand bucks plus tax it's a fully capable stage instrument as well as a brilliant controller for software virtual instruments using an iPad or a computer based DAW.
Fully Weighted Hammer Action is the closest you will find to a real piano feel.
Semi Weighted is somewhere in between synth action and hammer action. It's a little more forgiving of sloppy playing and a little quicker than hammer action which takes practice on which to master fast runs and arpeggios.
Generally 76 and 73 keyboards are semi weighted, 61 are almost always synth/organ action and 88's are pretty much always fully weighted and the better ones are hammer action as well.
I have had no experience with Rolands and as for the Krome, I used to own a Korg TR76 and currently own a Korg X50 and my experience with Korgs has been that they are great for synth sounds and the orchestral sounds are pretty nicely tweaked right out of the box, but programming them can be a royal pain in the ass.
The reason why I am so hyped on the PX-5S is that as far as future obsolescence goes, the keyboard would stay useful for decades to come. Not only does it come with excellent sampled piano voices and a full complement of organ, general MIDI and instrumental and synth sounds, but it is also designed to be a versatile MIDI controller as well.
The reason why this is becoming more important every day is that more and more VSTi (Virtual Studio Technology instruments) are taking over the studios and stages these days and the sounds are far far better than anything available even in a $5000 workstation.
So in essence, the budding future musician these days, only requires a good, solid controller and a USB hookup to a fairly modern computer and the sky is the limit as to what sounds can be produced.
And if you are the type of person who is addicted to hardware gear as I am the controller approach still holds water.
Simply by adding low priced sound modules to a controller instead of buying full fledged keyboards, you can have the stability of hardware along with the versatility of VSTis simply by adding a few compact modules to your rig.
If you are looking at a future in creating music then all you really need is a good, solid controller or stage piano with controller capabilities and you can grow your horizons one component and one piece of software at a time.
If I were to start over again from scratch today starting out with nothing the PX-5S is the first instrument I'd build on.
BTW, you didn't mention a working budget but assuming from the synths you listed you're in the $599 to $900 range.
That puts the PX-5S pretty much in the ballpark.
Shop around and you can find them for close to $900.
Gary
