I would have to say a RICH skiller with LOTS of 99's would be the best, seeing as a skiller can be turned into any of the above. No one makes accounts and says "I'm never going to train WC in my life", they usually say they're not going to train a certain CMB skill. A skiller can be made into anything, skillers are the most expensive without a doubt.
Skellie master, if you think about it for a second, a skiller can be turned into a maxed out hybrid in maybe a month with the right money. Alch to 70mage, ice burst MM skellies till 94mage, barrage the skellies till 99. Chinchompas at the Khazard gaurds, Red Chinchopas at the skellies. Dragon Bones on a guilded altar. Skillers can be turned into anything dude.