I got a GT traffic hybrid for year round commuting, it has served me well the past 2.5 years irrc it was about £300 when I bought it to replace my mountain bike for commuting. It is faster than a mountain bike on the road but a hell of a lot slower than any respectable road bike. I'm going to stick with it as for my 5 mile commute a road bike would be more comfortable and faster but I cant justify the cost to change it right now. The only benefit it has over a road bike is its a lot burlier so I don't worry about bunny hopping off kerbs but everything else is worse (slower, heavier, seating position...)
I would 2nd getting btwin triban from decathlon, go to your local one and get fitted by the staff, contrary to opinion they actually know what they are doing as most of the ones in my store are cyclists themselves.