RuneCrafting?
Seems like a bit of a waste in my opinion.
Personally I'll probably do herblore or something that's fast xp already, meaning it costs me 1/2 the amount whilst 2x the speed.
I would have done something that normally takes a bit of time to train, so you'd get double the xp in that particular skill, which would also be the reason you've chosen Runecrafting, am I correct?.. I would say I'll go for Dungeoneering a bit..
I will be doing herblore, people say no matter what skill you do its all double xp so it doesnt matter. But doing herblore im halfing the cost as well so I believe it is worth it the most.