Xbox live arcade recommendation

Hello i was wondering if anybody could recommend an xbox live arcade game that has a reasonable price and good replay value.

thanks

I would have to reccomend, Bastion, Outland, Trials and megaman 9.

I figured thats pretty varied in genre and are imo best in class, bastion is an amazing story

i hear renegade ops is good im looking to pick that up soon also LIMBO has received much praise but i havent gotten around to it, too much stuff getting in the way!

shadow complex. amazing side scrolling action game made by epic. last week i know they marked it down to 600 points, dont know if its still that low.