I've been looking at upgrading my Panasonic laptops into this century. I've been waiting for either a reasonably priced i3 or i5, or the refurbished Lenovo Thinkpad.
The core duo processors start at about 150, and they come in some very expensive packages, like the X200.
At about 200 (these are newegg prices, current) you start finding specs like this:
Refurbished: Lenovo ThinkPad T410 [Microsoft Authorized Recertified] 14.1” Notebook with Intel Core i5 2.4Ghz, 4GB DDR3 RAM, 250GB HDD, DVDROM, Windows 7 Professional 64 Bit
In my limited laptop buying, mainly Panasonic, and Apple, I have found upgrading an operating system is usually stopped by no driver development.
So you spend 1200 dollars for your Panasonic CF-51, find another that has a processor twice as fast, but can't find drivers for the other, newer components in your machine.
I tend to view a laptop as an appliance you buy, get what you want up front, and then buy another when something is so compelling you either want, or have to change.
On the Mac side, that makes me never buy another. I've been through this with Macs costing 4000 dollars, and doing much what you are doing, but, upgrading them was intentionally
blocked by Apple.
Merc has long suggested the Lenovo Thinkpad line is the place to be.
With the i3 and i5 cores reasonably priced, and sometimes the i7, and the prices down, that would be my pick. Most are available with Windows 7. I do use Windows 8.1 with Classic Shell, and Start8
worked well, also.
I can't help but think whatever you buy now is not going to be able to run Windows 10, and that for that reason, you should minimize your laptop investment, if you are going to use Windows.
Can't find any SSD equipped Lenovos at newegg. I'm with you on suggesting this is mandatory.
If I decide to do this, I seen T420 and T510's with excellent specs. Also a T430S with excellent reviews, but it's 700 dollars.
http://www.newegg.com/Product/Produ...59&cm_re=lenovo_laptop-_-34-318-307-_-Product
Lenovo Laptop T430S Intel Core i5 3320M (2.60GHz) 8GB Memory 256GB SSD 14.0" Windows 7 Professional 64-Bit
Haven't priced the cost of an SSD, or if the refurbs come with any sort or restore system, or, if you have to clone the drive.
DD is REALLY good at that;-)
In looking at prices, it appears the SSD's are used as an excuse to charge a very high price for what otherwise might be bought under 250 dollars with a mechanical drive.