Road / Light Touring

I need a new bike, I've currently got a Boardman road bike but it's a tad too big and is getting destroyed by my commute and the rubbish roads near me.
In the future I plan to do some light touring, the kind where I'll only need rear panniers and I'll continue to do a fair bit of road riding, I'm not bothered about doing a Tri or anything like that but will do a few 100 milers and will regularly ride 50 odd miles at the weekend.
For comfort I've thought of a steel bike and I intend to keep the bike for a while so have thought of a good steel frame that I'll then slowly upgrade.
So far I've thought of the following, does anyone have experience of any of these frames and / or can comment on their suitability?
Bob Jackson - Audax End to End or World Tour
Thorn - Audax (maybe a bit lightweight)
Salsa Casseroll Double - would it be up to laden rear panniers?
All suggestions and comments are welcome!
In the future I plan to do some light touring, the kind where I'll only need rear panniers and I'll continue to do a fair bit of road riding, I'm not bothered about doing a Tri or anything like that but will do a few 100 milers and will regularly ride 50 odd miles at the weekend.
For comfort I've thought of a steel bike and I intend to keep the bike for a while so have thought of a good steel frame that I'll then slowly upgrade.
So far I've thought of the following, does anyone have experience of any of these frames and / or can comment on their suitability?
Bob Jackson - Audax End to End or World Tour
Thorn - Audax (maybe a bit lightweight)
Salsa Casseroll Double - would it be up to laden rear panniers?
All suggestions and comments are welcome!
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The important thing to check is the chainstay length you will probably be looking in the range 410mm-420mm - even if right now you don't think you want to fit more than say 25C tyres, in future you might change your mind, so a little bit of extra flexibility is worth having.
I wouldn't obsess too much about small differences in frame weight. Relative to the weight of the fully-built bike (never mind bike, plus you, plus kit) these will be pretty small.
Good point on the Chainstay, I'm looking at ones that'll handle up to a 700*28, don't think I'll need more than that, may start ruling bikes out though that'll only handle a 700*25.