Ok, but the only thing i still don't get is that the Fios modem/router is wireless G. if i keep that Fios router and purchase a wireless N or AC access point, connect it hardline to the fios modem, will my wireless be faster? or does it bottleneck at the fios modem since it is only G?
If you connect the AP via ethernet cable directly to the router, yes, you will get the N or AC speed (internally). Externally, you're still at 50/25.
If you get a full wireless AP (as in the picture above), then you're limited to what the router can give out. In this case, 802.11G.