I would recommend a Deneb. You can put all the patches, poseidon USB and more in the flash...so no setpatch reboot...all the updated stuff is available on power-up...smartfilesystem, too...works very well and supports os 3.x / morphos / and os4.
There are some limitations on OS4 but it's still way more than worth it. I have two of them and it is one of the best purchases I made.
I haven't installed my Deneb yet, care to share the file you loaded into your Deneb that gets rid of the reboot/double boot and has all the good stuff already installed as soon as my A4000 is booted?