Both classes GH and SK are good in oly, but because i prefere adventurer as dagger, i advise you to take SK.It's a real pain in the ass.And take 2 weapons with you, 1 for damage and 1 with acumen.A bow would be nice too,in case you're out of mana
PS.Try to get a weapon with magic mental shield with you, in oly.it's good against sleep.
And some epic jewels.