I think it is reasonable to suggest that the OP consider what he expects to achieve in spending a considerable amount on a relatively recent purchase. Was his initial purchase a bad buy? What made him choose the bike he bought in the first place and why does it need to be upgraded so soon?
The world's sheds are full of bikes that people bought with the best of intentions. They start off super keen, and read cycle magazines and forums. They buy a reasonable bike, often going with recommendations from their bike shop, or from reading reviews. Then they read about upgrades and start to think that they should have bought better and really should upgrade what they've bought - often before they've even done a couple of hundred miles and built up any experience or knowledge.Whether they do the upgrades or not, they eventually find that cycling is not as easy as it looks, or it does not fit in with their lifestyle or other distractions come along and they end up being occasional cyclists at best.
Then again, cycling may be just what they were looking for and they start commuting to work or going out for long runs at the week-end. Either way, I think it better for the OP to take a bit of time to build up some experience and knowledge before jumping into an expensive upgrade that he may not benefit from in the long run.