Trying to get a ssd card on black friday. What specs should I look for?

Akhan1

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Sep 19, 2014
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My current specs:
i5-4690k (4.5ghz)
amd radeon r9 280x
8gb ram
500gb 7.2k hard drive (7 years old lol)

Now i'm not sure what to do, try to just buy a 512gb ssd card, or get a 256gb ssd and run it in raid.
If I run my 7.2k hdd in raid, will it really slow down the ssd card?

another option i'm thinking about is getting a 256gb, redo everything, then run another 256 or 512gb ssd in the future in raid. What will be the best to do for the price, and on black friday, hopefully I can buy a ssd from walmart on their website.