Propbably the cheapest 210 you can get would be Caltar II-E 210/6.8 (I have one) what is Rodenstock Geronar. It is a triplet, but it performs well, although to get most of it you should stop it down to f16. It is a light lens (~250g) when compared to 210 f/5.6 plasmat lenses. However - it would not be a very wise choice if you want to use it with 5x7 too. With 210mm image circle it will cover, but will not leave much room for movements.
Coverage-wise you get most from the sigle coated (marked inside the filter thread) Fujinon W lenses. the 210 just coveres 8x10. The later multi coated (marked outside on the lens barrel) Fujinon W lenses have somewhat less coverage, but the 210 W would still be fine on 5x7.
Then there is the latest Fujinon CMW lenses - I have one - the 125/5.6 - I like it very much (I use 4x5).
Then there are the Fujinon A (180/9 and 240/9) lenses but are not exactly cheap. They are very light and beloved by many users. The Fujion C are only available at 300, 450 and 600 mm focal length. There is also Nikkor M (200/8 and 300/9) which is also very light but again not cheap.
Both Fujinon A 180/9 and Nikkor 200/8 would cover 5x7 with movements, though you should check this more - I do not have a hands on experience.
Caltar II-N lenses are Rodenstock Apo Sironar N lenses - all of them are multicoated. These are supposed to be very good ones too. Caltar S are most probably Schneider Symmar-S lenses, but maby not exclusively. In general Caltar S are older than Caltar II-N lenses.
For the 150 lesnes - applies the same as above. But if you want to use it on 5x7 you need to go either with single coated Fujinon W - the one with 46 mm filter thread (look here !
http://members.aol.com/subgallery/) or a Rodenstock Apo Sironar S (Caltar brand not available).
Then there are a few large coverage lesnes out of production like (Apo) Sironar W or Shcneider Super Symmar HM. Both cover about 250mm buit are costly and also quite large (370 and 740 g respectively).
Of course - much depends on your subject and personal preferences.