@Jon-PokerVIP i7-4700 is still the cream of the crop when it comes to consumer CPU's. The first PC you posted would actually be a downgrade!!! The second one would maybe be a 10% upgrade when it comes to performance and you most certainly wouldn't notice any difference when it comes to poker! Feel free to buy that sexy monitor but forget about buying a new PC IMO. i7-4770 should be sufficient for all of your poker and streaming needs for at least 2-3 more years (maybe more!).
If you want to refresh your PC experience here are some steps that you can do that will be cheaper and more impactful than buying one of those two new PC's. Feel free to do any/all of them.
1. Buy a can of compressed air and clean the insides of your PC (
Guide).
2. Reinstall Windows (make sure to backup your important files first!).
3. If you don't have an SSD drive yet, buy one and install it into your PC. (
Samsung 850 EVO).
4. I assume your PC was a prebuilt one in like a generic noisy case? If so you can buy a silenced optimized case like Fractal Design Define R5 or
Fractal Define Mini C (choice will be dependant on the size of your motherboard so if you decide to upgrade the case make sure to find help from some tech savvy guy) + a cheap but quiet CPU cooler (
Rajintek Themis is a solid choice) and your PC will be much quieter and will look much more elegant. Some of the possible problems with this step - if you bought your PC as a prebuilt option power supply and motherboard can be custom which would make putting your PC into a new case and installing a new cooler tricky (maybe even impossible) so if you go with this step definitely find someone that knows computers and will help you both choose the case/cooler and then install both.
Again, if you can't be bothered to research and do some or all of these steps on your own find a computer savvy guy that will help you. If none of your friends are I assume you can find a guy/company that fixes/upgrades PC's and he/they will do all the stuff I talked above for a few quid.