Go for the 05 if you can afford it. The 04 doesn't have ramping etc. as stock - but, if it is 'Spitfired' then it is worth getting.
If you can get a new marker - then the ION is your best bet (ignore the stupid uneducated remarks about 'plastic' bits).
The ION is very customisable in every way.
If you can, have a go of both before you buy - then decide.
HTH