I've had them all - LC LC II LCIII LC475 Q605.

I'd go with the Q605/475. I have 128MB RAM, ethernet, and a full 040 loaded with a 2 gig internal drive. I have an external SCSI tower with CD, Tape, Syquest, and an 9 gig drive.

It's running at 25 Mhz but I plan to bump it to 33 Mhz (that's the rated speed of my 040)

I would never let the Q605 get away!

I still have an LCIII (I think) that I use with the Apple IIe card.