Integrated Amps with a Headphone Input

Oops... Big oversight on my part. I own a pair of Harbeth M30's. They are pretty easy to drive

I have not yet purchased headphones... but, on my short list are Sennheiser HD650 and the HiFi Man He500. Hope that helps. Thanks everyone for their recommendations thus far.

Are the tube integrated options with headphone inputs pretty limited?

So would I be better off just adding a headphone amp to my system?

Just wanted to update this thread. I ended up getting a Luxman 550 A II. I was a bit concerned about this 20 wpc Class A amp being able to drive the M30's, but it works spectacularly based on my listening level preferences. This Luxman is fantastic. Next step is to purchase a high-end headphone. The Audeze LCD-2 are on my wish list. Thanks everyone for your input.