ar es1 with stock arm add rb300 or get rega p3

I am thinking of doing a similar upgrade to my AR turntable. How much work is this? Is the RB arms compatible with the standard AR arm?

eltogo, a great deck...

i have just finished the said upgrade, es deck,rb-300,incognito rewire,heavyweight,vta adjuster, new rewire of motor,new pc, then mounted a new aurum beta

for the sub $500 i spent on the upgrade minus the cartridge, all i can say is WOW..... i love it(compared to a p-2 benz silver combo)
taking an older deck and giving it a new life was a pleasure both sonically and aesthetically
the sprung suspension is, imho, better then a rega "p" series

what is your price range for a new front end