I am not trying to rain on your parade. The Ferroli Modena is a quality combi. Budget implies cheap and nasty. There is nothing nasty about the Modena. They do charge to extend the boiler warranty, but it is still far cheaper overall.
I did check up on Ferroli Modena and it was around £600 for the 32kw plus £300 for 10 years warranty total £900...its a cheap boiler but with an expensive warranty, that's 50% of the boiler cost
Vaillant charge £180 for 10 years.