You are a fabulous hubby to be supportive of your wife like this. However, let your wife make the decision about what kind of machine she wants - it may be completely different then what you had envisioned.
My DH was all set to buy a new machine one year because he thought I needed one. He enlisted our daughters to help him pick the machine and both said to him "Let Mom do her own picking so she can find the one she likes/wants/needs." It turned out that I am in love with vintage machines and none of the newer ones make my heart go pitter-patter so I didn't end up with a new machine but as new-to-me machine. DH said he would never have chosen one like that for me.
Chris