Which is that shop in Chennai that sells second hand imported guitars. Could you please give me the contact information.
The advantage of jumbo frets or scallopped fretboard is that you dont need to really press the strings hard. Just touch them and they get fretted. If you are used to playing Indian Classical istruments like Veena or Sitar, then you'd understand them much easy. The problem is if you press the frets more than the required touch, it will start sounding as the note in the next fret. Unless you are good enough, this wont help you. These things are easier when you want to play faster and there's no way these things are going to improve your speed. Precision and Speed is a factor of practise not a feature of the fretboard.
Just follow your instincts and you will land up in a good purchase.