My favorite in the Prestige series, the Grado SR225i is a superb sub$200 headphone. The SR225i is much more controlled than the SR125i and a bit smoother than the SR325i. Retaining the excellent Grado midrange and intensity, the SR225i also adds a bit more space to its presentation than the lower models. Comfort wise, the SR225i can be quite stiff and tight on the head when first worn, but they loosen over time. The build is sturdy without being overwhelming. The SR225i sounds great unamped, but when paired with just a simple hybrid tube amp, they really blossom in the bass department without muddying up the sound.
 
Overall, the SR225i is a great introduction to the Grado sound and an excellent addition to any headphone collection.