There truly is no 'best'. IMO even some of the entry level AV receivers might suffice. It depends on which actual features you are looking for (e.g. Airplay, USB ports in front, etc.). Do a little digging/spend some time looking at features in the shops or online in forums (hint: look at detailed product reviews), then return here with questions about which features you don't understand/want refined in context of your system. Brands I'd consider include Onkyo, Denon, Yamaha and Pioneer. I'm not as crazy about Sony, but that could work too depending on your preference.
I have purchased an Energy Take Classic 5.1 home theatre speaker system and need to purchase an amp/receiver for it. I know diddly about electronics but I do have an iPad 2 and wifi. Our tv is a Samsung series 6, 6000 LED if that helps. Budget is negotiable.
Thanks in advance.