If you interview with Gulf Air, one thing that you'll notice right away is that they will present themselves, life in Bahrain, including the package and all monetary issues up front even before they even ask "Why do you want to work for Gulf Air?"
Depending on your background, this can be a real refresher. I remember having gone to interviews where they play games and ask such questions like "do you know how much we pay?" and "what do you know about our company?"
Traditionally, Non-Type Rated applicants have gone either to the Boeing 767 or the A-320-- these are considered to be the "junior" airplanes in the GF fleet. Last year and again this year they have announced the need to hire direct to the A-330-- this is a bit of a contentious issue, as progress from the A-320 to the Airbus widebodies has been by seniority. One thing that you should know is that Boeing FO's
normally do not transfer to the Airbus fleet, nor vice-versa. So yes, there is a seniority list, however things do not happen "strictly" by seniority (current situation as an example, also upgrades are subject to passing a "command assessment").
As with your mutual fund, past performance is not an indicator or future growth, and it is hard to predict upgrade times. GF words the outlook carefully. In the past, the transition from the A-320 right seat to the A-330 or A-340 right seat has been less than 2 years. Given current demands it looks like there will be many opportunities for those with Boeing experience to make an upgrade in relatively short time to the 767's. It is generally accepted that GF has one of the shortest times from new-hire to the left seat in the region-- however, I would figure on at least 5 years (others might contest that).
Income will depend on the fleet you are on simply because of the amount of flying you do and overtime, as well as your family status (married/# children). The base salary without any family allowance, education allowance, communications allowance, housing allowance, time away from base, overtime, call-outs, etc. is 1443 Bahraini Dinars per month ($3848 USD per month).
Based on my personal situation, the average yearly income for a married FO with 1 child on the A-320 will definately put you well inside the income bracket you have mentioned-- in fact, probably on the top side of it. This is based on "money in the bank"-- with a furnished apartment already being covered by the company. Keep in mind that at present, there is no taxation in Bahrain. Based on your personal spending habits, there is disposable income available, as well as the ability (and need) for personal savings (no pension plan).
Hope this information helps.