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Also, if you are just starting, I feel that necro gear is much cheaper than warrior gear and will be better for farming a warrior alt later.

Necros have so much awesome utility. There have been times where healers were low in KC, and I'd just tank on my monk with a necro healing me and some bard/chanter slows and maybe some bard regen. Of course, that's not the ideal role, and certainly not something you'd be doing in 99% of situations. They are great at farming nice items in higher levels and good for soloing in the downtime when you can't find a group (unlike warriors, which, unless you have some really good gear, probably can't solo much at all).

Main point is, necros are a good class for people starting out.