Last time i was out in california for work i tried me some Tritip. Hard to find a place that sells it where i live, but its my FAVORITE cut of meat, by far. If youve never tried it, i suggest you give it a go.
When i get them they are usually about 2.5 pounds, and run about 12$. Marinading is probably better, but i just dry rub a ton of spices and seasoning salt on the outside. Im a fatass, i cant wait. Get your charcoal grill super hot, then sere the outside of the meat on all sides to lock in the juices. Take it off the grill and cook some hamburgers or chicken or whatever then when your grill is at a lower temp, put it back on and slow cook it the rest of the way. The result is a TENDER delicious chunk of meat that will give you an orgasm.
Edit: judging by my second pic, it seems im eating the most ticklish part of a cow. I know if a woman touches me there it makes my legs kick like a drunken redneck being tased.