Please try and find a Tiagra equipped bike if you can. 2012 + is a totally redesigned and is the equivalent to 105 level in 2006.

Sora is Shimano's budget road componentry and so is made to a price and will always be not quite as good. 2300 is basically for big store box bikes and really doesn't even count as road worthy spec.

Maybe try and see what is available second hand. Get the measurements of the Raleigh and use them as a guide to compare to second hand bikes on the market.