you don't want to drink cognac, it's gross. you'll be out fast too which isn't the goal if you're going for a weekend bender. plus dark liquor gives you worse hang overs than the clear.
if you want some good lq, try bacardi big apple (35%) and tastes really good. soco, always good.
disarono which someone already said is good, but not that hard.
frangelico is really tasty taste, but even less hard than disarono. you could mix it with the extra potent version of kahula if you wanted. speaking of which, can't go wrong with kahula.
but ya, if you wanted to push your budget you could try to get some stoli elite, walker blue label, fine wines/champagnes...and you'll give the impression of having booze knowledge like myself (who worked in a liquor store).
good luck, but heed my advice lol.