A few years ago when I was at the same stage of my training I considered paying extra for twin time, but it is completely pointless unless you are planning on doing Flying Instruction, Air Taxi or similar work. Airline recruiters won't care - except with passing interest as a topic of conversation.
The key things with hour building is (a) do it economically, (b) have a helluva lot of fun buying bacon butties at far-flung aerodromes, and (c) incorporate a little bit of training, such VOR tracking, Flight plan trips into foreign countries etc.
At no other time in your life will you be 'forced' to fly 100 hours in a relatively short space of time. Right now you might be thinking mainly in terms of getting the hour-building done so that you can start the commercial licence, but in the future you'll look back on it as a wonderful opportunity to fly expensive aeroplanes for fun!