looking for earbuds, for computer use, priorities are budget and sound isolation

I'm looking for some earbuds, preferably IEM's.  My requirements are, highest priority order first:
1) Low budget, ideally below £60 (~$90).

2) Sound isolation.  The less I can hear (ideally even with nothing playing) the better.

3) I'm not savvy with the jargon, but what I'd like is accuracy to what the sound is.  No need for added bass and such.  I don't need it to favour any specific genre of music, the less discriminating the better.

Usage is all at computer; listening to podcasts, video games and the occasional music of varying genres.

Right now I'm drawn to the etymotic hf2 because of the excellent noise isolation and reportedly good sound quality.  I believe they're the same as hf5 but weirdly, cheaper despite having the addition of a mic.  They're within my price range (cheapest I found are £60 exactly).

Also on my list to consider are klipsch image s4 (spotted some on ebay for a steal price), maximo imetal 590 (can't find any in the UK) or etymotic mc5 or er-6i.

I'm guessing this isn't an exhaustive list of the buds that would fit my requirements.  These are a request for my birthday in less than a week.  Hope someone here can get me up to speed on what the ideal purchase would be.

I'm no ear-plug virgin, so I'll probably be able to take the deep insertion of the etymotics.  Thank you for the helpful response.  Something that came up after writing my post from my reading user reviews is that the hf2's are quite fragile and you'd be lucky to surpass a 6 month life-expectancy; not sure how accurate that is.

There's still time left if anyone else wants to pitch in with their own suggestions.  Thanks in advance.

One other thing I'm wondering about is whether vibration from the cord rubbing against my clothes is going to be an issue. It was with the previous 3 dirt-cheap buds I bought.