Advice needed

calonuk

Ok so i have been told i need to change some things on my bike (see previous post) and i am looking to upgrade to this

http://www.ebay.co.uk/itm/320757415065? ... 1438.l2649

probably won't buy from ebay but price seemed ok.
is this model ok? are there alternates to shimano for the same price or cheaper but better quality?
Your help will be really appreciated.

Many thanks