I would buy a nice cast iron griddle and set it over one of the burners, preheat the grill and start the steaks on the cast iron griddle and once the steaks are seared on both sides move steaks off griddle to finish cooking.
I bought 2 new 22" OTG kettles back in 2009 and both came with a pair of weber charcoal baskets. I purchased the kettles at Home Depot. I also purchased a OTG 26.75 at Academy for $118 +tax and it also came with weber charcoal holders.