The "Amiga Experience" changed from model to model and from different upgrades.
The A2000 is a fine machine, I have 4 of them in various flavours - from crazy expanded to hardly touched - each offering a unique feel. I also have an A4000D heavily expanded and that is yet another completely "different" experience.
Like some others here I have multiples of every Amiga model, each with different upgrade paths and upgrades!
Fortunately for me space is not the issue, I am also quite lucky as my wife does support my Amiga Addiction. However I say to my self EACH machine must have a purpose a use if you will or it has to find a new owner.
I have 3 primary A1200's
One of them is PPC/BPPC based
One of them is PCI / 060 based
One of them is a custom build 030@40/64MB RAM in a CDTV chassis (dont worry the CDTV gubbins passed away before I got it)
While they can near enough ALL do similar things, Each one of these machines gives me a different feel - a different experience of the Amiga A1200 and that is really what it should come down too...
My 3 A2000's (the 4th is stock)
One of them is a P3 1Ghz x86 / GVP 040@33 Hybrid / 2MB CHIP with lots of gubbins
One of them is a A3630@25Mhz / 8MB
One of them is nothing more than an 8mb GVP + SCSI card
Again like the A1200 each has a different feel to, also in this regard each has a different OS too.
So where am I going with this..... well its quite simple..... that A4000 when you get it will really give you a completely different experience, not only will it be 32bit ( not 16bit ) it will also be quick, snapier, faster loading along side upto 16MB of FAST RAM and 2MB CHIP - yeah you could emulate it..... but lets be honest - you could easily do the same for the A2000.
The reason we keep the REAL hardware is there is that intrinsic - something special that draws us... binds us to it.... it may all be nostalgia but I think its more than that.
In the long run the A4000 may not offer you a better experience than your A2000. However what I can sincerely promise you the A4000 will offer you a completely different Amiga Experience and its one I think you will really enjoy as well.
