Personally i'd go TD%, i've had several and they beat the older engines hands down and electics are not to be shyed away from, every car in production has them, and has done for donkeys years to the point even 300TDi had an ECU towards the end of production.
I'm currently fitting a TD5 into my D-Lander build...
Well i bought it this morning, got the 175 mig with reg, Y sized bottle of Argoshield light and all the bits and bobs, also bought myself a nice speedglas auto-darkening helmet too
I've done a few mins of welding and after tweaking the settings a bit got the famous bacon crackle noise so guess thats all working ok....i'll post a pic of my first attempts EVER later when i've done some more but so far i've stuck a bit of box to some angle and no ammount of abuse has shifted it!
Yup, thats the one, no longer in production and Hobart are owned by another brand, and are no longer manufacturing or selling units under the Hobart brand, so Wellington told me the other day!
I have a new one here ready, the problem is getting it out of the "pressed in bit", the 2 bolts are out but i cant get it to shift as there isnt a place where you can rest it to belt the middle as the joint has a flange under it?
I went to Wellington in poole today and asked about the 140....they dont make one and havnt done for a long time apparently, in fact hobart are no longer in business!
They do have 175's tho which come in @ £205 inc vat and they will throw in reg/wire for gas conversion too
I rang both BOC and airproducts the other day and BOC is considerably cheaper on both fill and rental than airproducts. Their prices also include VAT where AP's dont.