Rather than mulling over higher clock speeds on i3, you should rather be contemplating the step up to i5 or i7. Unless you're really on a tight budget, I'd avoid anything with an i3 in it.
Even if that means you buying something with a smaller hard disk ... because quite honestly, a 1TB drive in a laptop is unnecessary and only encourages you to dump more stuff on it and makes backups even more harder to discipline yourself to do because of the larger volume of data. A 500gb or 200gb drive should be more than enough on a laptop... as it helps maintain that discipline !
8GB of RAM is good, I wouldn't buy anything with less than that (or if you do, budget for some extra RAM chips)
Personally I've only ever owned one 17 inch laptop... now I only ever use 15 inch ones. What you loose in display space, you gain in battery life and portability, and given your last phrase (my bold) :
I use Office and other Windows related software, do not watch movies, basic gaming etc
Quite frankly I'd wonder what you're doing looking at 17 inch in the first place if all you do is browse the web and play with spreadsheets.
