Yeah it's a question that I've asked myself a few times - I'm 375 BS - but now I'm into SSC I've been able to make myself the belt of the guardian and boots of the protector - which are both nice - but I also have Leo's belt and passed the other day on solarian's boots - so there are alternatives out there.
Depends on what you want to do with it. I keep getting tempted to drop mining and level up engineering as well (I can make enough cash with my lock) but it's damn expensive to do bearing in mind I'd be doing it for:
a +stamina trinket when I already have the vengence card and the spyglass
a helm when we are taking down Vashj on a weekly basis
I'd stick with what you like the idea of - if you like the option of making a few bits of armour later in the game (plus some starting tanking gear like the felsteel set) stay BS - if you want to play with some toys as well switch to Eng. Just be aware that it's an expensive run to 350 eng and would your money be better spent on other things (or saved for a mount)
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