i mostly use stock skins except for some melee switches andd support classes
scout is almost always stock
soldier: usually stock although sometimes gunboats when i feel like using them
pyro: always stock with his speed-up hammer
engineer: stock although sometimes i like using the gunslinger
heavy: stock with speed gloves
demoman: always stock except when demoknight
medic: i usually pick whatever i feel like using but mostly its the quick-fix with rescue ranger and ubersaw
sniper: awp with jarate and bushwacka
spy: stock with diamondback and cloack&dagger