TRS-80 Model III. 2MhZ Zilog Z-80 and a whopping 16k RAM, 8 k of which I installed myself!
My second was an Osborne 'portable'. If you call 30 pounds of steel 'portable'.
Third was a Commodore PET.

I like the ones with built in screens.
I think the best I had so far was a Commodore Amiga Video Toaster. Amped up on a 40MHz 68040 processor, and 16mb of RAM! It rrrreallly flew.