Here's my take on the subject...
I've never ridden or priced the Nomad but I assume that it's most likely the most expensive of the bunch. My closest parameter of comparison was a Mean Streak. That had decent power (for a cruiser), suspension was nice and good brakes. The details of the bike didn't win me over though.
The Vstar 1100 is a very good cruiser for the money and, in my opinion, it looks and feels less cheap and more refined than the Kawasakis. Easy to modify the engine and get good power/sound.
The Speedmaster would most likely be my choice after all because I like Triumphs. Good suspension, the brakes are better than on the America (don't go for the America, by the way), great looks, very unique and not a total Harley clone. Feels very good. The sound and power output leave a lot to be desired but the engine revs rather nicely and it's very easy to do simple mods that will have it sounding a bit meaner and putting more power to the pavement.
If you love Trumpets and are emotional about your bikes get the Speedmaster. If you like the best value for your money get the Vstar. The Kawasaki is more expensive and should feel a lot bigger, so only get it if you loved it after test riding all three.
Do test ride all of them and make your own decision.