I was in a similar boat lamenting over the lack of CPU cards. Then I discovered UAE and never looked back. I was what you would consider a power user with a couple of Video Toaster Flyer A4000 T's.
Using commodity PCs' With multi-ghz CPU's and gobs of ram, you get a super Amiga with a spending spree $400 Wal Mart PC.
That's the price they're asking for modestly expanded A4000 or A3000 with graphics cards and other amenities on Ebay in the USA. Pretty Crazy... I paid $650 for an A4000 030... in 1995!
Happy with my A1200 and 030/50 as it's used for games and tinkering.
If I want to do modern things like play MP3's etc. I'll use UAE, a Mac or a PC.
A true fully 68k compatible 2ghz Amiga would be great though.