Been there, done that!
Shell out for the proper door. That helps remind you to NOT do what you did to break the first one! I spent HOURS picking out glass from my woods after breaking my door; it was like staying behind in school to write "I will not..." a hundred times on the chalkboard!
TIP: ALWAYS close cab doors; no exceptions (otherwise you'll make excuses that will get you right back into this situation)
I had about 700 hrs on my NX when I blew out my left door. Considering the environment I have, all those predicting it to be idiocy to operate cabbed tractors in woods, I feel that it's really no more than normal wear and tear: of course, I'd have to go another 700 hrs to make this work out.