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I'm not currently a Sonic.net customer[1], but what I liked about them was most importantly they know how to run their network, and have good peering and transit: they don't do PPPoE, or have wrong MTUs set (ATT's devices advertise a 1480 MTU for 6rd based IPv6, even though the MTU they actually accept is 1472, and they also rate limit sending of needs frag packets). They have a customer forum where their network and service teams interact with customers for those things that are broken, but not broken enough to call support. The CEO is active in the forums as well.

[1] Sonic doesn't serve my area directly, so I had to pick between (discontinued) line shared 6mbps ADSL1 and resold ATT uverse at 45mbps; and then 1gbps became available, so I went with that.