A late goal from substitute Jonathan Tehoue cancelled out Tomas Rosicky's header to earn the League One side a famous 1-1 draw and a lucrative replay at the Emirates Stadium, with the winners to play Manchester United in the last eight.
"The quarter-final against United was a big carrot, but we have still to go back to the Emirates," said Slade.
"We are humble, but proud that we have got this far and have another opportunity of playing against Arsenal in a fantastic stadium. I told the lads `you will only enjoy it if you get some kind of performance' - and we got that in the end."
Flamboyant Orient chairman Barry Hearn had pledged to take the squad out to Las Vegas should they earn themselves a replay.
Slade added: "The lads had Elvis Presley on when the chairman walked into the changing room and were singing `Viva Las Vegas'! The end of May or in June would be nice to get three or four days away, I am sure that would be fun."
Source: PA
Source: PA