I got the sporregar shield as soon as I had the rep (was probably level 64 or so by then). Fabulous shield, great for when you're overgeared.
Currently have 18 stam on it because I was helping a friend to level enchanting, but a shield spike works just as well. I always keep it with me, massive fun. Had my healer making fun of me in heroic Arc the other day on some of the AoE trash pulls.
If you've vendored your blue gear, it could be tough. The goal for downgrading gear for 5-mans is to find gear that gives spell damage and sacrifices avoidance (block I consider OK) and not too much stam. And there are a few great quest pieces that do this (the hands of fate for example)
Holy gear (most of my holy gear is pvp gear, so it has a good amount of stam) is usually a good option, or just some spell damage neck/rings.
Actually... I hate to admit it, but I made them just to get a few points while leveling blacksmithing... The Khorium set, or just a few pieces are great for these situations. Decent spell damage, int, mp5, and stam. Whenever I find myself overgeared, I toss on one or two of these pieces (boots, legs, belt - I usually use the belt as I have nice spell damage epic boots and am still using the Timewarden's legs). If you happen to be running a group through regular BM... with some decent spell damage gear you can really tear up the damage. (throw in a Ret pally to help if you want to mage your rogues cry)
They need to add an epic craftable shield to the game that has an upgraded proc like the Sporregar shield!