First of all Damien, welcome to Coffee Snobs.
Now for the hard bit, the truth. Can you handle the truth?
The Breville grinder is not good enough, (frankly neither is your spice grinder) and youd be throwing money away for no improvement.
Thats why its call a spice grinder not a coffee grinder; coffee is not a spice.
If you want to save a few dollars, the Sunbeam 0450 is essentially the same as the 0480 but doesnt have a metal body or automatic grind setting; for those differences it should be about $50 cheaper.
Ive had one, as youve read, theyll do.
The Breville just wont cut it (pun intended).
Just getting a proper grinder will make a difference to a better tasting and more consistent coffee.
I know friends who use a spice grinder and admit that if they are using freshly roasted coffee its a step up from preground supermarket beans.
Please tell me you are at least using freshly roasted beans..........????
I havent used either but hear that both the Via Venezia and the Ikon are both good machines.
In fact I recently bought a second hand Ikon for a young friend of mine.
I dont remember the specs off the top of my head so dont know if the VV has a Stainless Steel boiler but do recall the Ikon does, and thats good because it should last longer.
So my recommendation is buy the Ikon and look for a Sunbeam EM0450 grinder.
P.S. while you are there, ask if they have a spare basket, Part number ESP 4/51.
Dont let them talk you out of it as youll need it to get the best coffee out of your freshly ground coffee and new machine.
The basket is NON-pressurised; thats the key.
Pressurised baskets are used with (stale) supermarket coffee to give the impression of fresh coffee.
The one I bought the other day to go with my young friends Ikon cost less than $10.
Good luck on your journey to better coffee.