I know you said not software..but...
Hardware is always great..but if you have no software that utilizes it...its just there doing nothing. Invest in the Amizilla project.. U will be da man.
If you write the software, the hardware will come (since both the Pegasos and A1 are already powerful systems..they just lack software)
As for hardware...I thought the BoXeR was awesome idea at the time.
I find it difficult to believe that if you make new hardware (video) for classic Amiga's that it will actually be put to use..PC's/Mac's are more powerful and already have surpassed the classic Amiga in the video department. If I was in your shoes I'd work on A1 or Pegasos hardware/software..that is the future.