ok, we gonna go backwards -
anti ghosting is good; it's not *fundamental*, but in rare occasions it can cost you a kill or two, if you play really-fast FPS games, like CS, quake, even CoD or BLOPS.
however, there is no reason to spend a lot of money on "gaming kb", as most of the advantages they say they provide are in fact BS.
gaming mouse - this depends on 1) the size of your hands and 2) the grip style which you use. idk either, so i can't really tell you which mouse to buy but, the G9x is the best, or one of the very best, mouse on the market.
other mice you could consider - the abyssus, the Sensei, the G400, the M500, or deathadder. stay away from the sidewinders.
my best advice is to try them. if a friend has a mouse you like, then get that one. if you have a shop nearby that sells PC hardware, go tell them you want 2 buy a mouse, but that you want to try them first. a good grip beats a super sensor every day of the week.
(btw - the best keyboards, if in the future you want to spend a boatload of money, are Filco Majestouch, cherry red mx switches; i suggest "tenkeyless")