I did my CPL MEIR with Bristol Flying Centre (same as Bristol Aviation i think) last year and can recommend them.
For the CPL more time on the Arrow is probably advantageous over the Warrior as it operates a higher speed (about 140kts instead of 100kts for the warrior), so giving you more time to adjust to faster navigation + quicker thinking time etc - However, ultimately that depends on your experience and ability.
As for the ME IR i would definately suggest taking more time in the aircraft over the sim. Yes it's more expensive, but the sim really can't get you so used to the actual realism of flying - like noise, turbulence, vibration, temperature, radio chatter etc.
Anyway, whichever you decide to go for, good luck.
Jon