Reasonable, up to a point.
You are budgeting about 2x the cpu cost for the graphics card; that is a good balance.
If buying new, I would opt for latest 8th gen intel.
Do not buy a single 8gb stick.
Buy a 2 x 4gb kit to run in faster dual channel mode.
Do not assume that you can add another 8gb later.
It will not be supported and may not work.
ram must be from the same matched kit.
And 120gb is a bit small for a C drive.
Go with 250gb and defer on the hard drive until you actually need the space.