Ok what most might have glazed over.
1.) use muriatic acid (hardware store $6 for 1gal) on the cylinder walls to melt any aluminum transfer the piston might have left on the chrome plating. A hot-strip/heat gun will speed the process and make sure you're well ventilated when you do this.
2.) Once transfer is removed: if you find holes through the chrome plating replace piston and cylinder with OEM or AM kit
3.) If your cylinder cleans up good: replace the piston with something quality (meteor, episan, vec, OR OEM)
Chainsaw Parts
4.) if you don't have a mity vac or equivilent to check your crank case pressure (as recomended above) replace the oil seals, gas & impulse lines and you should be fine. a complete seals and gasket kit is only $10-$15 (northwoodsaw again)
5.) I also recommend replacing the fuel filter and checking your worm gear on the oiler.
As for a bar... You really do get what you pay for so it depends on if it's going to be a regular work horse or an occasional user saw. I personally have been using the total super bars and I love them. they wear really well and aren't terrible in price and they look cool to boot! The Total and Stihl 24in bars are probably about the same on price at about $70. I would make sure to get a pro replaceable tip bar. The best bars out there right now are... In the order I would rate them in...
1.) Sugi Hara
2.) Total Super Bar: jonsered or husky dealer, or look for a tilton dealer here
Tilton Equipment :: Total and Tecomec
3.) stihl OEM bar
4.) Oregon Pro bar (bailey's online or ebay)
5.) Windsor Pro