Ok, I decided to use PowerDraw
I'm gonna give it a try, I've been with it today and seems quite good.

Anyway, I heard that version 1.4 could be used with DelphiX and can be used for alpha and transparencies accelerated by hardware.
As I don't see any information about this in the PowerDraw page, could you please tell me what is it really capable of and if it is better to change all code from DelphiX to PowerDraw3 (instead of DelphiX and PD 1.4). What I really need is alpha and transparencies.

thank you, and good work!