John
I've never used a Peterson but hearing others use them the presets seem to be good.
If I were to get one I think I would look at the Classic stomp
http://www.petersontuners.com/index.cfm?category=170 as I prefer a switchable in-line tuner . You can get one for around £140 I think.
If your happy to program settings yourself, the tuner I use and am very pleased with is Sonic Research ST200.
http://www.turbo-tuner.com/ . Bit harder to get, I bought mine on-line from USA. Ended up costing me around £120.
Before I used a Korg LCA-120. A lot cheaper and worked fine for me particularly after programming.
http://www.korg.co.uk/products/tuners/lca120/tu_lca120.aspYou can program one set of presets or use focus tune mode to tune with offsets. Looks like you can get one for around £50