One thing - be careful with sizing. Surly spec's their frame sizes a little weird - they tend to "run big", and you might end up with a frame that's too big if you're not careful. Go to their website and download their spec sheets, and carefully compare the sizing to your current bikes - it's likely you'll need to downsize the Surly frame by 2 cm from what you're currently riding.
That's true. I ride a 55cm road bike, and a 54cm LHT. The LHT effective top tube is 0.5cm LONGER than my road bike. So I downsized 1cm, and it fits perfectly well. If I had gone up instead, it would have been too big.