There's excellent info on all the different Lenco models at: http://www.btinternet.com/~a.d.richarson/hifi/lenco/lenco_land.html. You can cut and paste this address or do a Google search for Lencoland.
Basically, the mechanism for all the idler wheel Lencos is the same. They had heavy and light platter models. Jean Nantais, who started the monster Lenco thread, recommends the L75, L78 (semi-auto with auto arm return) and the GL88 and GL99, which apparently were only made for the British market. All the above are heavy platter models, the latter two were armless so the most versatile - for the others you need to cut off the corner of the top plate to accomodate most arms. Note that US/Canadian models had motors for 60 Hz whereas British/European had motors for 50 Hz and may not be able to be adjusted to 33 1/3 rpm in the US/Canada.
Basically, the mechanism for all the idler wheel Lencos is the same. They had heavy and light platter models. Jean Nantais, who started the monster Lenco thread, recommends the L75, L78 (semi-auto with auto arm return) and the GL88 and GL99, which apparently were only made for the British market. All the above are heavy platter models, the latter two were armless so the most versatile - for the others you need to cut off the corner of the top plate to accomodate most arms. Note that US/Canadian models had motors for 60 Hz whereas British/European had motors for 50 Hz and may not be able to be adjusted to 33 1/3 rpm in the US/Canada.