I used to have a Dell Inspiron N4010 as my main PC and I recommend it for a affordable PC that can be upgraded
(Warning: a SSD would be preferable and, a external fan is required to have it last longer and, expect to get 4 solid years with it!!)
It does have some issues (cheap frame, cheap keyboard but, if taken care of well, it should last longer than mine)
overall, I know for a fact the processor can be upgraded. There was a thread on the dell support forums:
http
/en.community.dell.com/support-forums/laptop/f/3518/t/19515572
The other thing I like about it is, the Ram can be upgraded too! In my N4010's final days, I upgraded it to 8GB of Ram! Ultimately, the motherboard is failing and, I had to retire it
🙁 motherboard died due to heavy abuse!) I also dropped it many times!
As weird as it may sound, this is a great PC ("Middle Way") and, I consider it the "Lexus" of the laptop world!
On Amazon, I found some in the range of $200-$600(totally overpriced for pristine condition)
Best part about them is that they come with Windows 7 Home Premium! When I upgraded it to Ultimate, It ran like a tank!