How do you control fermentation temps? Will you be able to control fermentation temps in the 14.5g conical? You're planning to brew 5g batches in a 14.5g conical? If you bottle straight from the conical how will you add priming sugar?
I think you imagine the conical is going to be a better solution than it is probably going to be for you at this time.
I'm going to sing along with the chorus and say that your money could probably be better spent elsewhere. Temp control would be my suggestions, followed by temp control, then maybe kegging, nice brew pot, AG equipment... A conical is a piece of equipment that it seems to me will require a good deal of other equipment to make it a convenience rather than a pita.