New bike or not?

Hi all,

I'm fairly new to cycling and am after some views on whether it's worth me getting a new bike, predominently for commuting (30 mile round trip 3 / 4 times a week) and possibly also as a club bike (not that I've joined one yet...).

I've got a Dawes Giro 500 (about 6 years old) with Sora levers, front and rear derailleurs, tektro brakes (no model notation so I'm guessing entry level), some shocking Asson WM-R01 wheels (google doesn't acknowledge their existence and frankly I can see why...), and an Ofmega Vantage front crank / chainring.

In short, it feels pretty heavy, like you're constantly fighting it to get it rolling and I'm thinking if I was to start going out on club runs I'd just find it hard work.

I have a Focus Cayo (2010 version) that I use for sunny days and sportives and by comparison, the Focus accelerates and climbs for fun. I'm not willing to use it for anything other than best, though.

I guess the crux of my question is whether I'd get any benefit replacing my Dawes with something like the Boardman Team (http://www.boardmanbikes.com/road/road_team.html) or Verenti Kilmeston (http://www.wiggle.co.uk/verenti-kilmeston/) or would something in this price range feel just the same as my Dawes?

Thanks in advance.