B'twin Triban 500 - the best use of £450?

Hi all,
I'd really appreciate some advice from all you pros..
I'm starting a new job in august with a longer commute & my current bike is absolutely knackered and ready for retirement.
I decided its time to buy a new (and proper) road bike.
I'm looking to spend up to £450
Researching online seems to give Decathalon's B'twin Triban line almost a cult following and the new Triban 500 with Sora groupset is £450
Triban 500 - http://www.decathlon.co.uk/triban-500-r ... 06944.html
My Questions
1 - Is the Triban 500 the 'best' bike around for £450?
2 - Am I actually better off getting a 2nd hand bike of ebay but of a higher spec?
3 - Any of you have any other bikes I should be considering for around this price? (or is it a case of just splitting hairs)
Genuinely thankful to all who could spare some advice
I'd really appreciate some advice from all you pros..
I'm starting a new job in august with a longer commute & my current bike is absolutely knackered and ready for retirement.
I decided its time to buy a new (and proper) road bike.
I'm looking to spend up to £450
Researching online seems to give Decathalon's B'twin Triban line almost a cult following and the new Triban 500 with Sora groupset is £450
Triban 500 - http://www.decathlon.co.uk/triban-500-r ... 06944.html
My Questions
1 - Is the Triban 500 the 'best' bike around for £450?
2 - Am I actually better off getting a 2nd hand bike of ebay but of a higher spec?
3 - Any of you have any other bikes I should be considering for around this price? (or is it a case of just splitting hairs)
Genuinely thankful to all who could spare some advice
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