Acoustic Guitar?

I feel as though I should get an acoustic guitar so I can attempt to write songs easier, saves me untangling my jack (which I have now broke). An acoustic would make it easier for me to quickly get an idea out into song form. All the ideas I have came up with seem to leave my head before I can get my guitar plugged in.
Well if I decide to get an acoustic guitar it will just add to my expenses. right now im saving the £380 for the Dearmond M75-T, the another £75 on an electric violin (because my acoustic violin isn't full sized... and electric violins are cooler), I may add another £250 onto that for a BC Rich Virgo bass guitar, and now the acoustic guitar. I think I'll leave it after the violin.