I too. have a working A1000. I'm not lucky enough to have found an InSider for it - and in a recent state of no money I had to sell both of my Starboard II boxes (with SCSI and everything!).
I just bought a perfect Xetec Fast Trak on eBay - for an A500/1000. It's a side car box with SCSI and RAM expansion. Looks like it will fill the bill - has 4Mb of RAM with the SCSI!
Some A500 side car type expansions can be used on an A1000 (they just sit backwards) IF the mouse/joystick ports clear.
I prefer using a 1080 (1084, 1942, etc) rather than a TV.
All this stuff pops up on eBay from time to time. Some times the prices are good, sometimes not.
I have also seen a limited amount of A1000 stuff on " chasethechuckwagon.com ".