Big fan here of the 1800 layout. Almost as small as a tenkeyless but with the useful numpad. I don't know about you, but I have never ever in my life used the nav cluster in 100% keyboards. It's much easier, comfortable and intuitive to use the numpad for that, so the nav cluster for me is redundant and a waste of space. That's why the 1800 layout is perfect for me. Also, I sometimes use the enter on the numpad, just stretching my thumb without release my mouse. And obviously, the numpad is a must for entering numbers.
I have 3 Leopold FC980 keyboards (2 with MX Blacks and 1 with Topres), amazing boards, by the way. I don't know what's going on with the stock, but they aren't available anywhere. When mykeyboard.eu or candykeys have FC980Cs back in stock I will order a dozen of them. XD