I’m going to be doing this, I have my cbt in two weeks. I was looking at the honda cbf 125, i will probably buy new, looking at second hand values they do not seem to loose any money! then when I want a bigger bike, i will just sell it/trade it in, and won’t loose much money!
If you are going to be buying a bigger bike, then definitely get a geared motorbike. Saying that, mopeds do offer better weather protection and kit storage….