I told him that Grados are typically recommended for rock, but since I've never heard one its hard for me to really recommend it. I did warn him that most don't seem to find them very comfortable though. I urged him to join head-fi and make a decision based on what he found.
If he prefers the drums, then get the SR225i (the slightly messier bass of the 225 makes them more fun to my ears). If he prefers guitars, get the SR325is. Both fit within the budget.
With the SR325is, it does come out of the box rather sharp (initially a little jarring), but once you get used to it, you come to appreciate the texture and the cleanliness of the guitar strings.
Or tell him to blow the budget and get an RS1i and call it a day.