I'm glad to see you are building a desktop. The only thing I see in your parts list that will not work is your power supply. The specifications tab on newegg states that the CORSAIR CX series CX430 only has 1 x 6+2-Pin PCI-E Connector, but the photos I looked at of your card on Gigabyte's site (The Gigabyte Radeon R9 270 2GB Video Card) shows you need 2 x 6-pin PCI-E Connectors.
www.gigabyte.com/products/product-page.aspx?pid=4840#sp
So sticking with the same brand you've choose the next step up would be the CORSAIR CX series CX500 500W for $59.99 which is a $15.00 increase in your price. This will give you the 2 x 6-pin+2 PCI-E Connectors that you need for that card. I would personally go with the 600 watt version, but the Gigabyte site recomends a 500 watt power supply so you should be fine.
www.newegg.com/Product/Product.aspx?Item=N82E16817139027
www.newegg.com/Product/Product.aspx?Item=N82E16817139028
Next always pay attention to your socket type! Your motherboard is an AM3+ and so is you CPU so your good there.
Speaking of motherboards the Asus M5A97 R2.0 ATX AM3+ is a good board. This is the same board that is in my wife's gaming PC, and we have had zero issues with it to date. It supports DDR3 2133(O.C.)/1866/1600/1333/1066 memory standards. With the memory you have selected the 1333 is the important one. I would recommend DDR3 1600, but i wouldn't pay much more for it if you are on a tight budget. As far as will it fit it is an ATX board, so you would look at you case specifications.
Your case supports ATX and micro Atx according to the video on its newegg page. You should always pay attention to your card leingth. The The Gigabyte Radeon R9 270 is 254mm (10 inches)once again according to the newegg video you can fit up to a 270mm card with the hard drive cages installed.
Finally to some things up, pick a power supply with 2 x 6pin PCI-E connectors, and everything else should fit fine. I hope this was a help to you, and post if you have any other questions. P.S. Here is the video covering you case specification, and overview.