basically,

at some point, your going to want both.

me, i started accoustic. and played with that 6 years before getting an electric.

playing accoustic all that time forces you to work harder than an electric to get the same approx. sound. for example, i wanted to improve my solo playing on my electric. and what i did was actually give myself an all acoustic diet... you have to work hard to get a full bend on an accoustic, you have to work really really hard to get a tapping sound out. it works on the same principle that baseball players use: put weights on their bats when warming up to make it harder, and when they actually go to bat they swing harder than they thought.
when you go all acoustic, and then go electric, you'll find playing electric was wayyy easyer than you would think.

so my advise is get a nice acoustic and totally perfect that before going electric.