Ya Kingston is just as good, but mushkin is an option if he plans to buy another 2GB stick of it in the near future, this leaves him with spare room to upgrade to 6GB or more in the future if he want to. Its up to him really.
That combo should have no trouble handling any HD playback or any other media related tasks such as large compression tasks or codec conversions.
And you'll still be able to play a reasonable amount of games, The on-board 4200 is still good for older titles such as...well most things really, UT2004, CS: Source, BF2, COD2, COD:MW1, Half-Life 2, WoW, Dawn of War 1 etc etc. Heck i've heard Red Faction Guerrilla runs on it at low graphics settings since its mostly just a cpu hog.
Hmm usually by 'entry level' gaming i would interpret that user is willing to turn down resolution/settings to enjoy modern games and HD 4670 could cut it but if your budget is not set in stone for $414 AR
Yeah, I could of suggested a build with a 4670, but since hes already told us he will be upgrading to a discreet card in the near future I didn't. He said it himself "Good onboard GPU will do fine but PCIe is a must for future upgrade".
I think its wiser that he spend his money on a better CPU, RAM, Case and PSU at the moment rather than rush out to buy a 4670 which he will probably be upgrading from anyway in a month or 2 time.
I'm not trying to argue the obvious, I know a 5450 will beat any IGP on the market today. But if he is going to upgrade to a better video card in a month or so time don't you think the money would be better spent on a better cpu, ram and case now rather than just trying to snag a cheap PCI-E card which he will upgrade from anyway.
Also your taking the budget as after rebates rather than before like I tend to do, if you do want to take rebates into account tho there is another option.