Resolved questions
Which accent do you like and want to learn?

None. I am happy with a neutral accent.

Hello smiler

I think it is difficult to learn an accent, you can imitate but a native person will recognize it.
To learn it you need to go to school or live in the country for at least few years and even though...
Determination is a big factor here too.

@ Zaldy hello you can't have a neutral accent when you speak another language...

Sorry it's me again... but I want to say "accent" is the most difficult thing to teach or to learn... because it is a part of our identity.
You need to have a good ear, a good sens of rhythm and a good sens of imitation.

I wish I could learn British accent and live there as well... hehehe.

:)

As Marie-Hélène said, you only can try to imitate it. I like the sound of Irish and Scottish (accent). From Terry Pratchett's 'Wintersmith', for example:

Like, when we come back from drinkin', stealin', an' fightin', Jeannie gives ye the Pursin' o' the Lips.

Ooooh, save us from the Pursin' o' the Lips!

An' there's the Foldin' o' the Arms.

Ooooh, waily, waily, waily, the Foldin' o' the Arms!

...

(Hard to be a Nac Mac Feegle, coming home, not having met the expectations of your kelda.)

(You have to imagine a rrrolling 'r', of course. And everything is pronounced entirely different. Using the correct melody. Is this still English?)

To me it seems that some essential components of accent are rhyme and pronunciation (if I correctly translate the greek terms m'etro & profor'a - μέτρο, προφορά).
Few ancient greek scholars claimed that rhyme has a single, innate degree of perfection that one has to learn. In my point of view, rhyme is one of the main carriers of emotion in a language.
Emotion though is a very complicated entity to explain in logical terms. One has to feel it first, otherwise it may be impossible to comprehend it.
Thus I would answer to the question saying I'd like to learn the accent of the virtuous person :)

Hello Smiler,

A mixture of all of them will sound really hilarious ,what about that ?;)

Hi, this Italki site has many helpful tips for you, the accent depends on where you work and which one is most acceptable.
http://www.italki.com/knowledge/contribution-Spoken+English.htm

I think we should not get too hung up on trying to sound like a native speaker.
Accents don't matter, as long as people can understand you, but pronunciation is important.

Well, I think America English is better.