Dini,
AFAIK, PRSA's are very similar to Personal Pensions except that PRSA's are the government intorduced pension vehicle with recommended max charges etc.
I suggest that you shop around for pensions generally and do not be too concerned about whether they are one type or other. Personally, I found that the best deal in terms of charges was Quinn Life Personal Pension. Maybe use this as a start point and take it from there.
Also talk to your accountant as there are big tax reliefs available to directors of companies for pensions.
D