Good afternoon, as a experienced cyclist/triathlete the best thing too make sure is that the bike fits correctly! For example I'm 6'1 and I suit a 56/57cm bike but this is dependant on a few factors 1, it's a actual road bike, 2, the makes of bike can vary slightly... It's important your comfortable. When you get a bike spend the 100ish quid it costs too get a correct fit... This is really important as a incorrect fit will fatigue you and injure you. On the note of 105 it's pretty decent I have it on my work/winter bike can't really fault it... Any other questions feel free to say, I also spent a year working as a road bike fitter and mechanic... Good luck
ps get friendly with your local bike shop!