For the love of GOD man fill out your spec chart properly or at least tell us what CPU and PSU you have.
You need to understand a couple basic things about trying to upgrade an old system.
1. If your CPU is too weak for it, you will not likely be able to utilize the full power of the GPU you're talking about. It's called bottlenecking.
2. If you're PSU hasn't enough wattage and amperage for a 770 or 290/290x, you will have to upgrade it. That is easier than upgrading an old platform CPU though because that usually involves a new MB, and sometimes new RAM as well.
I'll give you PSU scenarios for the GPUs you mentioned. This is recommended total system power.
"GeForce GTX 770 - 42A and a 600W PSU minimum
Radeon R9-290 - 31A and a 550W psu minimum
Radeon R9-290X - 33A and a 600W psu minimum"
Source:
http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards
These are conservative recommendations to allow for a range of PSU brands/models, but since amperage is given, it tends to rule out ultra cheap models because they typically have very low amperage. These recs are right in line with what EVGA recommends. Forget Nvidia recs, because they don't even mention amperage, which is the most important spec really. They also tend to list most any brand that supports SLI.
If you're not sure, the sticker on the side of your PSU should have the specs, if it's multi rail (more than one +12v spec listed), just list the model number. The single rail (only one +12v spec) PSUs are easy to get total +12v output from, but the multi rail ones require a chart that lists it, such as this
http://forums.guru3d.com/showthread.php?t=205763.