I'd leave your A1000 alone as upgrading it the way you want is going to be a painful and expensive exercise you wish you hadn't taken on.
But, if you insist:
MrMKL here (and Amibay) sells an IDE and RAM board for the 68000 socket. But you're going to need Kickstart 2.x+ (has scsi.device) if you want the IDE part of it to work.
DJBase here sells a Kickstart board that plugs into the A1000. But instructions are vague/misleading and there are wires that need to be soldered to the daughterboard. Jumper pads on the mobo get molested also... lol This board does NOT plug into the 68000 socket. Wish it did as it'd be a much simpler deal. BUT... you can "simply" make your own adapter OR wire up your Kickstart chip by hand directly to the 68000 chip itself. There are instructions how to do this on the net and maybe even Aminet.
This board you're talking about that adds IDE capabilities. Well, there's one for the A2000 called Buddha, that's a Zorro II card and the A500 one plugs into Gary and is called AdIDE. Good luck finding one of those. The Buddha Zorro II card is not going to work on your A1000 without a sidecar adapter or your own makeshift adapter, for which I currently have the parts for - but involves a lot of soldering/wiring.
Accelerators for the A1000 include the 14mhz 68000 AdSpeed and these Derringer 020 and 030 boards. Latter two are quite rare are overpriced and suck because most of the time, they do not come with RAM. 32-bit accelerator with no 32-bit RAM is LAME! And to add insult to injury, they're not really made for the A1000 without removing the friggin' internal 3.5" drive. Yeah, how's that for an "authentic" Amiga 1000 experience? lol Almost forgot... those 020/030 acclerators require your A1000 to have Kickstart in ROM also. DOH!
DKB's Multi-Start II is a Kickstart board that plugs into the 68000 socket and allows you to switch between both ROMS, but good luck finding one that uses the standard 16-bit ROMS. Most of the time I've seen these old Kickstart ROM adapters, they're designed to take Kickstart divided by 4 chips. Better know a buddy with an EEPROM programmer if you find one of those things.
