If you plan on buying a discrete GPU I'd go for the Athlon. The socket is AM3, if you buy an AM3+ mobo in the future you'll be able to upgrate to an FX processor up to Piledriver and maybe even Steamroller (I don't know if AMD is changing sockets or what). If you want to save in the GPU you can go for the APU, but with an A4 I don't know if it's gonna be that great, and maybe the price difference is not gonna be that different of getting the Athlon and a low end dGPU (which is probably gonna still be better than the iGPU of the APU, and you may even buy a passively cooled one). What's your budget? The Radeon HD 7750 sells for around 85€ (that plus the Athlon would be nice for a budget build), the Radeon HD 6670 for 65€ and the Radeon HD 6570 for 50€, if we go lower you have things like the HD 6450 or HD 5450. (Anyway I see the A4 is 45€ that's hard to beat) In FM2 you also have some Athlons without iGPU. If you go for the FM2 option you can as well buy an FM2+ (there are not so many at the moment) mobo and be able to upgrade to future Kaveri APUs but remember that the FM socket is for APUs and budget processors. Also the A4 most probably has newer tech (like faster memory supported and such) than the AM3 Athlon. Another thing, the APU will perform better the faster you get the RAM. I hope I am not confusing you but I think that's good information to know before you buy. Choose wisely!
PS: btw how do you post as anonimous??