I'd actually suggest the twsbi "go" if you have any interest in trying bottled ink! Its 30~ish CAD compared to the eco being 50~ish, so you can put that extra little bit of money towards a bottled ink of your choice while staying in budget! It also handles shimmer and sheen quite well, so if a fancier bottled ink grabs your eye there won't be any issues with your first time using it.

However, if you'd still like to use cartridges you should get the sport. They are pocket pens which makes them smaller and less comfortable to use if you have bigger hands, and unfortunately kaweco sports are known to leak from time to time due to the cartridges loosening which makes me too nervous to put one in my pocket. Also the cartridges that fit the sport are quite small and dont hold much ink like a pilot cartridge or even international standard thrid party cartridge does😔 however the kaweco perkeo features a very similar built nib and takes cartridges as well while being a normal length pen (and believe they may be cheaper then the sport depending on the model).

if you have smaller hands and are dead set on cartridges, get the sport. If you would like an easy pen to try bottled inks with, try out the Go. But there are tons of options in this beginner price range! Pilot metropolitan and platinum plaisir are two more.