Reply to Macbook Pro 15" Vs 17" for Serato ITCH?

Looking to upgrade my Macbook 13" Which do you guys believe is ideal for ITCH and other reasons? How's the font size and waveform size on the 17" ? I'm just afriad it's going to be too small with all that screen space. I'm really shooting for the 17" if I'm going to pay all that money.