Since you play for fun, and never real money, it doesn’t matter what denominations you use, so find a set that you like the looks of, and pick the denoms you like the best. Not sure what vendors would be best for you in Israel. Maybe something from Europe?
For 6-7 players, you could easily get by with 400 chips (maybe even 300). Assuming you want to play $5/10 blinds:
$5 x 150
25x 150
100 x 75
500 x 25
Generally, avoid choosing denominations that are 2x the previous denomination, I.E., 1/2/5/10/25/50 is really inefficient. The only exception is that 500/1000 is standard pretty much everywhere.