You're now at the point I was a while ago: having a vanilla A1200 and wanting some more.
I now have an A1200 with DCE internal flickerfixer (I use highres interlace, with overlay as my standard WB setting), OS 3.9, a PCMCIA nic and a Blizzard 1260 with SCSI card and 128 MB ram.
The Blizzard 1230 & 1260 are very nice turbocards: fast, reliable, can be switched off by pressing the '2' key while booting (great for compatibility) and the optional SCSI card gives you great expandability while keeping your original A1200 housing intact.
I have connected four drives in an external SCSI-tower to my A1200 and having great fun with it.
Like you, I don't like the A1200 tower solutions. Yes, they are great for expansion, but somewhere along the way, I loose my Amiga-feeling...
Oh, a reasonably sized (2-4 GB) internal 2.5" harddisk is nice to have. The internal IDE-controller isn't the worlds greatest performer, but it does what I expect it to do, and in combination with a reasonable turbocard (68030 and up), it does so at a very acceptable speed. Well, that is, acceptable for me... :-)