Need some advice from the experts. Given the choice of a new '05 is1500 21hp/48inch or a demo '04 is1000 21/48 (less than 50 hours) which would you go with, assuming the demo is in great condition and price difference is negligible? I'm torn between 4 wheel active suspension vs. 2 wheel independent? All I have is '05 literature for specs of the is1000, are there differences between '04 and '05 besides hp/deck sizes offered? Thanks!