www.weldingsupply.com usually is the cheapest in the US for welders.... anyway I ran the ranger 250 and thy have it for a couple of hundred bucks more so I dont know what home depot has... and Im real curious... Onan or Kohler motor??? (make sure you check ebay)
the sp175t is a nice LITTLE welder... but for a couple of hundred bucks more get a full size 250... better gun better electronics better duty better everything... the 175 is still a small welder and they cant pack in industrial components into it like a full size case
I have Ranger10... a bigger 250 predecessor, a powermig 300, and sp250.... and Ive had or tried the sp100/135/175 many times (sp100...junk..135.too small.. 175 still too small)
All this being said what you also need to factor in is the followingfor any engine driven welder....
You have to purchase any/all the welding processes you want to perform...mig tig stick... and they are EXTRAS ...not included... (you might get a cheapie stinger in the package)
an LN7 or LN 25 mig box//// up to 1000.00
stick/cable/// up to a couple of hundred.. I have 1000 feet..
hi freq box for tig// up to 1000.00
ground/quick connects/// up to 150.00
engine driven welders are sweet as you get pure dc power... but you are burning gas and making noise...
I use mine about 2 percent of the time... or course when you NEED one and NEED to weld away from the shop they are awesome.... but in my humble opinion buy a shop welder instead... POWERMIG.... thats where its at if you are spending as much money as you say you want to... otherwise a blue or red machine in the 250 amp range will set you back about 1500.... and for less than that you could buy a 50 amp plasma and still be under 3k... and have good equipment for a lifetime of welding and fabbing... oh and once you have plasma you will wonder how you ever did without it.....
this site is an excellent welding forum if you have further questions... hope I was helpful... you can always pm me if you need more
cam
http://www.chaski.com/ubb/postlist.php?Cat=&Board=welding