Yeah, I used to use levels almost exacley similiar to these...
Vegeta 500,000
Frieza (1st) 530,000
Frieza (2nd) 1,060,000
Gohan (Rage) 1,200,000
Frieza (2nd, Power Up) 1,400,000
Piccolo 1,450,000
Frieza (2nd full power) 1,750,000
Piccolo (Full Power) 2,000,000
Frieza (Third) 3,000,000
Vegeta 4,000,000
Frieza (Vegetas expectations) 3,600,000
Frieza (Final Form) 6,500,000
Son Goku 6,000,000
5-7mil...around their...
I only use 150/120 for Frieza/Goku because 150 is so integrated in dbz fandom...