Need a little help, please?

[plutomaniac]

I did see some AMD Phenom II CPUs that had AM3+ sockets, which caused my concern. Well, if things won't go well, then I might need to get a mobo that has either AM3+ or FM2. Most of the CPUs I see are supporting FM2 sockets.

Yes, as I said this is a dead platform. That's why. But for a total upgrade around 350$ are needed so it's not for you probably. You can just upgrade the cpu for now with something that should be ok for 1-2 more years without bottlenecking(your gpu is not that good so it won't make a difference).