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It is purely up to you, I like the Half-scrag or full scrag idea it fits so well into the city and the lay out for what Momma Toki is doing currently that I wish I had thought of it.
The necklace isn't a must have maybe you could hold off save some of your starting money and grab it when you level? With the amounts of water inthe game if you NEED that regen you can get it almost in one move from anywhere unless your locked up or otherwise trapped.
I'm very surprised that 1/2 scrag isn't +3 instead of +4 given the differences but /shrug.
In short you need to play the character you will enjoy playing, I don't want to decide for you ;p
Hmm so we need to keep you up and alive till you lvl and jump to 20 or more hp. I would be looking at maximizing the use of your funds since weapons aren't a problem.
Gotta keep you out of any spell effects, people have fireball, and call lightnin Yike.