Hi,
What you go for all depends what you want from an Amiga-like machine. I used to have an A1200 tower with BlizzardPPC & Blizzardvision etc. a few years back but I found it too unreliable to use as a main machine so I broke it up and sold it off. I currently own both a SAM and an Efika. The SAM has become my main computer, so much so that I'm getting rid of my Athlon64 tower pc and replacing it with an Asus Eee Box. I still need a pc around for a few things but I don't want it taking up a load of space. I like playing with the Efika and Morphos and I will register it in the new year. But as a package it doesn't cut it as a main computer. If you got a Peg with Morphos then sure that could be a main machine or the Macmini but not the Efika, it is too limited. Macmini does sound good, keeping half an eye out for one myself!
The SAM of course is a lot of money but I'm fine with that because I'm using it more than I would a PC because Amiga stuff is a hobby. If you think you are still going to use a PC/Mac as a main computer I would get the Efika because of the price but if you want a main machine buy the SAM or wait for Macmini Morphos.
Just my thoughts.
Cheers,
Rudi.