I realize there are a lot of /general/ bike threads right now but they have nearly reached capacity so I thought a thread of my own would get more attention.

This is currently the bike I own and use as a daily to go to the beach, get a coffee etc and I have done a few decent rides on it. It only has a few gears so when doing a somewhat longer rides (31m/50km+) it really starts to struggle. (I am aware its a cheap bike but I got it for free and made it work)

I want to buy a quality bike I can do some good rides on but I want to keep the vintage aesthetics and have new age tech on it. Can anybody recommend me any bikes which have these attributes? I would pay a few thousand but I don't want to be paying crazy money.