Going to Florida from Northern Ireland?

Question

I'm planning to go to Hernando, Florida in September to visit my bf, i was born here and i have dual citizenship in both the UK and Ireland and i have an Irish passport. As far as i can remember a UK citizen can stay in the USA for 90days without a visa (on like a holiday,not allowed to work and must have enough money to support themselves). Does this still apply if my passport is Irish, even though i qualify for UK citizenship?

Also in the September of 2008, going to college or immigrating to Florida may be a possibility, what would i need to qualify for a student visa?
And if i decide to immigrate can i still move back and forth between there and here and retain my EU citizenship?
What would the procedures and qualifications for immigration be to move to there from here?

Any advice appreciated, thanks =)

[I'm 18 now -19 in April- and currently in full time education studying A Levels, if that info is any use]

Answer 1

Both the UK and Ireland are members of the US Visa Waiver Program, so you can use either passport to enter the US and stay for up to 90 days.
http://www.travel.state.gov/visa/temp/without/without_1990.html#countries

In order to study in the US, though, you will need to apply for a student visa before you leave home.
http://www.travel.state.gov/visa/temp/types/types_1268.html

If you decide to marry the BF, he can then request an immigrant visa for you, which will get you a green card.
http://travel.state.gov/visa/immigrants/types/types_2991.html

Answer 2

The dual citizenship helps with the moving around and working stuff...if you are in school now ask at your local college how to get around and passport/visa issues...if you had only an Irish passport I believe you would need a visa...if all is okay you can visit and all but be sure by asking at the college there in Northern Ireland...
I am the opposite of you...I have dual citizenship with America and Ireland and want to go to Ireland and live and work and don't know the issues for me....also think of do the same in Canada...with the same questions about work and all...good luck!