Search Engine Optimization agency recommendation

[tautSquanuh]

Hello there!
Guys, i have a website, and i think i need better positions in Google, Bing and !Yahoo.
But what SEO agency to choose from?
So far i found these:
http://www.seerinteractive.com (cheap, they also offering SEM)
http://www.webmetro.com (look's nice, but overpriced, i think)
http://www.marketing-seo-services.com (very cheap and wide choise)
http://www.seoptimise.com (some British guys)

Is there any need in India SEO services? In fact, i have no idea what is India SEO - is it worth anything?
Thank you!