I would like to have a go at a tank - when I last did kits, in my early teens, I built a number of jeeps, DUKWs, etc, and my tour de force was a German half-track, but I never quite made it to a 'proper' tank. The Tamiya Chieftain Mk5 and Challengers have caught my eye, but I think the stash is big enough for the time being, got three to finish as it is...
I had a look at a Tamiya 1/48 Cromwell last time I was in my local Hobbycraft, although they're dear, they are exceptionally well made kits. I always built Tamiya and Italeri before, and I think you can't go far wrong with them TBH.