Hello; I love both snakes and lizards and think that they both make excellent pets, so it is kind of hard for me to choose one over the other. Snakes are lower maintenance, but lizards are more animated. It is really more of a personal preference thing. :)
Hmm; given what you generally like in lizard (the monitor-type look, and a big but not too big size); have you considered a a Northern Blue Tongued Skink?
They are often referred to as the 'Cadillacs of the lizard world', and are very intelligent, docile, interesting, hardy as long as their care needs are met, can be housed in a 40-65 gallon tank, are almost dog-like pets, and can even be hand-fed by their owners because of how gentle they are. They are omnivores and eat a mixture of greens, meats (chicken, high-quality cat food, snails, sill/wax/butter worms, etc), and fruit. They are a tad on the expensive side, but their personalities more than make up for it. I'm a bit biased, but in my opinion you really can't ask for a better pet lizard. :)
Here is an incredibly detailed care sheet that is a wonderful resource on Blue-tongue Skink general information, care, needs, and maintenance:
http://bluetongueskinks.net/care.htm
I hope this helps, and if you have any further questions at all on the subject or would like more suggestions on a good lizard or snake species; please feel free to message me and I will be more than happy to assist you. :)
Good luck on your reptile search!