I guess the CM400 is a standard rather than a cruiser, but it is a low standard with pullback bars.
My first bike back in 84 was a new 81 CB400T that I traded in on a 82 CB750K about 6 months and 6000 miles later. After putting about 80k miles on the 750, I picked up a like new 81 CM400A. The CM400 seat is about 2" lower than the CB400 seat and the CB has taller flatter bars, would fit you better than a CM. I was about 6-2 and 240# then and had to swing my knee out to miss the bars on the CM in making a u-turn, no problem moving along though.
Think you might be happy with the CB750 suggested above or any of the taller seat models of Jap bikes of the era. They are all quite similiar and in buying an older Jap bike the condition of the bike your considering is more important than the make. My son bought a 78 GS750 Suzuki new way back then and they had a choice of tall and short seat models too, as I recall the Suzuki T and E models were taller and the L models had the lower seats.
I've ridden a couple GS500s for the past 8 years and 120k miles and they've been to the mountains to play and I found them to be quite adequate in the mountains of upper NY state and down in the Smoky mountains in VA, NC, and TN when well ridden.
407,211 miles in 30.1 years for 13,528 miles/year average. Started 7/21/84, updated 8/26/14