I very rarely appreciate "bumping" of posts, regardless of how urgent a query is.
FWIW, I would say that you would more than double your starting salary within 5 years of qualifying, possibly by the third year. But I base this on the situation in the Big 4, smaller practices may be different.
Is there any real need to take the first job offered? If you are very nearly qualified, I would have thought there would be fairly high demand for your services, at least in Dublin anyway.
Your practical inexperience may count against you of course.
If you are really ambitious, you could always do ACA/ACCA post getting your AITI qualification, someone who is qualified in both taxation and accounting is very marketable.