Just my two cents, Bladedancer and Swordsinger are not something you would want to go solo with.
You should be able to get parties just fine if you ask around, since everyone wants one in their group, but without buffs they are hard to solo with later on in the game.
A Tyrant on the other hand does quite well without buffs, you could even go a warcryer solo. Use a one handed blunt and light armour (Art of Battle Axe/Blue Wolf Light for example) and you'll be able to self buff and solo quite easily.
The thing about Lineage II is later on you're kind of forced into having buffs to get anywhere, but some classes do better than others and some are looked for more than others. For a solo player, you'll have a hard time if you don't box a support.
Good luck in whatever choice you make.