well, when I earn enough I'm buying it. tell me, do any of those have these?
realtime reflections/refractions/ratracing
in-game mesh editing
PhysX physics engine
3 different programing languages
can make games for any gaming device (Iphone, Ipad, Xbox 360, PS3, Macs, PCs, Wii, DSi, DS, PSP, or basically any other gaming device you can think of)
is compatible with both macs and PCs
'just press play' testing/in game editing
I'm not saying those are bad, but this is for people who are going to make games for a living, not a hobby.
EDIT: also, you pay once, you get all their software, including any future update. you don't have to pay again and you keep the lisence.