Sorry for the Hijack of the thread.
To answer your question depends on where you are sitting for the year.
Will the purchase make a big difference in what you pay for taxes this year? or would it be better to wait till after the first and apply it to next years taxes? Something you should ask your CPA and rather quickly.
0% interest should only be the last deciding factor.
On a side note I have found buying in Late January has you having more leverage on price before they have to pay taxes on their inventory. But that depends on how firm your dealer is and how much you purchase from them yearly.
What ever I do I must do it right!