red stuff is barely comparable to standard if a smidge above, yellow is better,
but if you don't rate the ds2500's then budget wise your in a bit of a sh1tter. thats one of the pads that lots like to use.
next step might be to try performance friction pads. more money but good reviews, popular with the track car people.
or look at DBA or Dixcel. but for full pad and disc setup your looking the best part of £1000
not sure what project mu pads are like for price, but they are good quality as well