The only information that's required in order to give excellent advice on buying laptops are:
1 what will it be used for? Which applications and in what context the applications will be used. EG if spreadsheets are one of the applications, whether it will be sheets with less than 1,000 lines, or number crunching on sheets with 250,000 lines.
2 where you stand on the larger screen size vs portability compromise. EG a 6' 5" rugby prop forward with a car would be OK with a 15", whilst a 5' 1" slim woman that walked or caught the bus everywhere would be happier with a 12", 13" or light 14".
Anyone asking what budget you have is someone whose advice on IT you shouldn't take. Because it makes sense to buy the cheapest laptop that will be a great tool for the jobs it will have to do. IE what you spend should depend on your needs.
If you were buying a watch it would be madness to set a budget and then buy a watch at or just below your budget. Especially if all you wanted was a watch that told the time accurately and you weren't bothered about it being a piece of jewellery or a status symbol. It would make far more sense to get the cheapest or free watch that satisfied your needs.