The size of the solder pot depends on your needs. I've used all the machines 
listed and each of the small ones are good for tinning or soldering small parts 
and if all you need to do is one small part at a time. The Air-vac PCBRM fits 
the needs of a lot of people. You may have to put your boards in a baking 
oven to heat up a thick board or preheat any adjacent SMT parts that you've 
masked to prevent thermal shock. These machines are good for connectors up 
to approximately 2" and not for power bricks.
The next size machine with the most versatily is the M93 or Concept IV 
Wenesco. These have a long solder pot with 150 lbs of solder. You can do 
connectors about 8" long, power modules, or plug in several nozzles to do the 
same location on 2-up panels at the same time. The floor unit is rugged and 
has a bottom preheater and often a top preheater and laser pointer.
For the money you can't go wrong. The newest Concept IV adds more space 
between the heater and the nozzle/solder pot area than the M93. Cost is 
around $25K. Brian Lowe, owner will use a PB-free pot and impellar with 
nitrogen to inert the under the solder nest plate to virtually eliminate the 
maintenace of pulling out the pump. There are several for sale that I know of.
Benchmark Electronics, Hudson NH has an M93 top & bottom IR  preheat with 
all the nozzles for under $500. It was in perfect shape when I was there. The 
other is now at NEA Londonerry was good now needs cleanig up since another 
company left in a storage truck and let it get rusty.

Another solution for assembly repair is to get a Premier Tool Works machine. 
They make a rugged machine with convection preheater with a long solder pot 
and slide rail conveyor for around $75K.
 - For strickly selective assembly you can buy an automated Selective solder 
system for $65K. These machines can be either tin/lead or Lead Free by 
buying the 2nd interchangeable solder pot, no tools needed to change over.
 - Ace Kiss #102, RPS same thing stepper motor moving a 30lb solder pot with 
fluxer about $65K. The new Seho with Fiducial recognition for $77K loaded 
closed loop servos.
The Vitronic MySelective Stratham NH, has a series from the single Selective 
Solder $95K, fluxer closed loop servo, fiducial recognition & options.  They one 
pot $95K, to a small multi-wave pot for low mix/high volume, to the larger 
units with Selective 1 or 2 pots or 1 selective and 1 multiwave pot, $360K.

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