Yup i can handle the size i have bigger than normal hands (i m 6ft tall) . I even liked the xperia z ultra but it is over my budget and most of all i dont think i can fit it in my pocket comfortably and if i cant then its not a phone according to me
I find these characterisations amusing
Yours, is a phone must be pocketable. For others it must be operable with one hand and it must not look too big against your face.
The original 'phone' was neither, it just allowed people to communicate.
Btw, my hand span is 8.75 inches stretched. 5.5 is still unwieldy for me. Bear in mind the G pro has a reduced keyboard size to allow one hand texting.
Gaming is more important than roms . I like roms cause they give me better battery life and i find them more customizable
A bigger screen is better for gaming. So the 5.5 will be better than 5. Thing is does 0.5inch more really matter.
The point is you will be coming from a S2 which is 4.3 inches to G pro which is 5.5, see the
difference. Going from 116gm to 160gm, over 25% difference in weight which will be very noticeable.
Take S2 to ZL. From 116gm to 150gm. Again
difference is 20%. But only 5 inch screen.
Vice S2 to S4. From 116gm to 130gm. This
difference is less than 10%. Ergonomically speaking much easier to adapt and you get a 5 inch screen. What grabbed me with the S4 was how light it was. Once you add a case it will be more. But when you add a case to the others so will they.
About roms, what customisations do you want. What can you not live with here. There will be touchwiz based roms for the S4. However AOSP roms is another matter. MIUI might come to the S4 a year later, given their past performance. Battery life isn't an issue with the G Pro or the S4 because you can always add a spare battery, quickly and continue where you left off.
The thing about gaming and snapdragon 600 (or exynos) is heat. How long you want to game. How intense are these games. The high end games will get uncomfortable to play more than half an hour. Though a plastic case might makes this more bearable than aluminium or glass.
So you need some sort of thermal throttling or under volting kernel to provide that. If you can get that on the S4 then its a contender. Maybe paarki can comment on gaming on the S4 without any of these features. Maybe by next May,
Googy will come to the S4 as it did with the S3.
I don't know if you will get it on the G Pro. We don't get the E385 here, its the E388. The ZL has the doom kernel but its still a work in progress.
If you want to consider the ZL, you need to ensure thermal throttling as there is no user replaceable battery. Price wise both ZL & S4 match your budget. Though i see no problem with increasing it if you absolutely must have the G Pro.
but being a samsung fanboy i m angry about the s4 
I really feel Nokia should have entered Android market 