"1) No viruses ever on my computer"
Neither on Linux or OSX
"2) No more stupid malware"
Same as above
"3) Faster speed boot time and response time to applications"
What applications?
"4) save in my electric bill as I am using 400+watt power supply but the SAM 460 need only 100 watt to run. Saving a lot in heat and energy."
You can also buy low consuming x86 motherboards which are way more powerful and useful than a SAM460 at a fraction of the price.
If maybe you said "I want to buy a SAM460 because it will let me run Amiga OS4.1" I would understand (albeit at a very expensive price), but none of the reasons you mentioned warrant spending 1000+ Euro.
Just in my very humble opinion of course. =D
