Newbie question for new Monitor

Dear fellow simmers,

At the moment im using 1 x old 22" monitor (1280x1024) for my FSX and obviously, when flying (VC), you can barely read the PFD/MFD from there unless you click to pop it open. My question is, if I will buy a new 27" monitor, does it actually make it more readable? Should I go to 1920x1080? Then im not sure how my rig would handle that, as with todays setup i can make 18-26 fps on add-on airport with the T7.

I know my current rig lack´s the perfomance, but so far im still quite happy how it performs - given that ofcourse I need to sacrify some of the graphic settings... Anyway, I quess my question is:

1. If I buy new 27" monitor, will i get more view with the same resolution (mainly to be able to read the pfd/mfd) or do i need to go for higher resolution?

2. if going to higher resolution, how much would that affect on the fps?

3. or should I just park here, get the new monitor and use the old monitor as a second one for the pfd/mfd etc? what is the affect on that for fps?

My current rig:

i6, 3,2ghz, 8gb, 480gtx, 2 separate HDD´s.... (this was fairly high end machine back in 2010 )

Cheers

Thomas