You will get as many varying answers as there as replies he he. Posting your budget and room size and other considerations will help others put their replies into context.
+1
Members here have different favorite speaker brands. So better provide some bit of information to narrow the answers for you. Since it is a new HT system, then you need an AVR or maybe separates. Do you like Onkyo, Yamaha, Denon, Anthem etc? Some receivers are heaven match at a certain speakers. So be ready with your budget. Do you need a bookshelves or stand alone? Will depend on your room size. After speakers and receivers, then next is subwoofer
. Lots of question and uncle google has lots of answers for you too...goodluck to your journey..