A1200 + basic fast RAM expansion + 2x CF card + CF -> IDE adapter and CF -> PCMCIA adapter running fully licensed WHDLOAD is probably the best Amiga gaming experience, and the cheapest using 'real' Hardware.
Virtually all games have been WHDLoadified, and I can no longer think of a single one whether OCS, ECS or AGA that doesn't work even with an 060 expansion.
Get a 4GB CF card to act as your HDD with the CF -> IDE adapter and another CF card to use with a PCMCIA adapter to transfer files to and from your Amiga, from your PC/Mac etc.
You can also add at least partial CD32 support by adding a PCMCIA CD Rom solution eg. Squirrel SCSI or similar.