hello, i play in a blues/country band ,i currently play bass and acoustic guitar but we feel the band would sound far better if I played a double bass. Basically I know nothing about the double bass and am looking for some advice, do I look for full size or 3/4? I have seen a few for £350 - £400 will these be pants? are the add on pick ups any good? any good budget makes? any advice would be greatly apreciated. thanks.