the bad monkey is inexpensive that's why it's a big favorite......but i will stick with my ts808 AND ts9dx...they are both good sounding pedals stock!
we have keelley modified boss and ibanez pedals in the store that i work for...it is required of me to try EVERY pedal in the store....
the verdict? keeley modded pedals are good, BUT very little difference...and there are lot of more choices out there...
in terms of overdrive/distortion pedals.....it's better to buy a boutique than to modify a pedal.....if youve got the boss or ibby pedals to begin with, i guess it's worth modding to them to breathe new life into them but as for buying a 'new' pedal? depending on your budget, go for gold and buy your ultimate purchase....your dream pedal.......
if money is not an option...i would buy a porsche....