1) First off, you want to wait for BENCHMARKS but your main issue will be the GTX950M... just because the minimum specs say "GTX550Ti" doesn't mean you'd have a good experience. You may. You may not.
Some games run fine at minimum. Some run so-so. Some run horribly either because lowest settings at low resolution looks good but runs shitty or because it looks crappy but runs fine, or because it runs crappy and looks crappy. Just can't predict until the game has been tested.
3) also, why the "DVD" mention? Do you have a DVD player?
If not you'd buy on STEAM and download.
4) Try running some BENCHMARK like TimeSpy and see how the score comes out... actually here's some benchmark numbers I have for a GTX680 and GTX1080... you'd be below the GTX680 but I'm just copying and pasting. you must run at the EXACT same specs including resolution. You can run at 2560x1440 using DSR if your monitor is 1920x1080 (NVidia Control Panel, manage 3d settings, Global, DSR, select 1.78x scaling... then the 2560x1440 option should appear in games and benchmarks).
-DX11, Ultra, x8AA, full screen, 2560x1440
*If you then write down what PERCENTAGE SCORE you seem to get overall vs GTX680(similar to GTX770/960) and GTX1080 then you can estimate how you should do once Metro Exodus benchmarks come out.... for example if you got half of a GTX680/770/960 then if a GTX770 gets 60FPS at Medium/1080p then you'd maybe get 30FPS at same settings.