I've been running a 36/48 with a 12-25 cassette, but I'm switching to the exact combo you mentioned: 34/48. I'm also replacing the cassette with an 11-32. That still gives me 7 cogs at nearly the same range I have now, plus the 28 and 32.
__________________
"I feel like my world was classier before I found cyclocross."
- Mandi M.