Just went through the same thing as you.
Can you afford it?
Do you need it?
Do you want it?
I was able to afford it fairly comfortably and wanted it; need was the battle for me. In the end, my decision was not based on my lack of self worth or if I deserve it. I didn't decide by my feelings...I purchased my dream machine knowing full well that I would use the heck out (and I do) AND it very well may be the last machine I ever purchase (age). Large purchase for pleasure is a really tough decision for mostly everyone. It really was hard (agonizing!) buying something that costs more than every major appliance (put together) in my home...or a small car.
No matter what you do, it will be the right decision for you. Let us know what you do!