Coffee Appreciation

I don't have experience with the Gaggia MDF but I've used a Eurika Mignon quite a lot and from watching a youtube video they looks very similar in performance. It's possible to get grinders with some extra features like the Rocket Fausto but I honestly don't think it's worth buying anything more expensive than those for home use, they'll both happily do espresso grind, the areas they fall down is things like the quality of the adjustment system and heat dissipation if using continuously.

The next real step up would be something like a Mazzer Super Jolly, which costs about £1k or just under, which you could definitely use in a commercial set up, just not constantly mainly because of the heat build up, but would be overkill for home use.

Above that are grinders with much larger and better blades, way better adjustment, consistency, and deals better with heat build up. Ones like the Mahlkonig Peak, but you're looking at about £2k and only worth while in a high volume commercial setting.

Out of interest when was the last time you took your MDF apart and cleaned the blades? If it's been a while then try your hand at that because it'll help with grind consistency.

Understandable. My advice would be not to upgrade anything, but that's easy for me to say. I would get something like a Wilfa Svart so you can leave the Gaggia ready for espresso, a few manual brewing gadgets and then start exploring all the experiences you get from coffee of different origins.

The Mahlkonig Vario is a great grinder, don't know what the RRP is nowadays but mine has served me well for a few years...