I bought x99 of everything eventually, but I have over 200 hours played and the 99,999,999 DP title. Depending on your skill if you can perfect any 9s/10s with Cool Master you should get 250,000 DP if I remember correctly. Earning DP in F 2nd feels much slower xD
For me earning DP in F 2nd feels a lot faster because I can actually use challenge items since there are ones besides being able to perfect songs and shy target. I'm just not good at perfecting songs and slow to improve even though I've played nearly 1000 hours of project diva in total... It's amazing you can get so much from perfecting songs.