An answer soon would be appreciated as I have to order one within the week and i have to ship it out of the states to my country, so please help me as i wouldn't be able to return it if it didn't work or fit in my Emachines el1358-53, and THANKS IN ADVANCE.
With only the stock 220w power supply, neither is going to be a sure thing to work in your rig. Of the 2 of them, I would suggest going with the "new" tech and going with the R7. Both GPUs will perform similarly.
You should strongly consider a PSU upgrade as well. 220w is really too little. I would recommend a solid 500-550w PSU for future growth. You really could go as little as 400w with these GPUs as well. I recommend Seasonic, Corsair, and XFX PSUs. There are several other good brands as well.
What is your budget for a PSU upgrade, along with the GPU upgrade?