Well that plan fell on its face. Rock Auto wants $139 shipping for the Monroe SP2070 springs!!! I might as well get the VW 5-green springs thru idParts.
I figured I'd post my results here, so others can learn from my experience.
Baseline was a 2004 Jetta TDI wagon, 5speed, stock other than a Panzer Plate skidplate. 250,000+ miles. I decided to refresh the suspension, so in December I replaced all four wheel bearings, front control arm bushings (with TT bushings), rear axle bushings (TT), ball joints, tie rods (inner & outer), struts & shocks (Koni Red, for Wagon), strut bearings, and springs. I also had the wheels aligned as soon as everything was put together.
I chose the MOOG VR6 springs for front and rear. The MOOGs were exactly the same height as the stock, but thicker diameter and one more coil each.
After install, I had gained just under an inch on all four corners. Now that I’ve driven for a couple of months, ride height has settled in at exactly the same as before. The ride is nice, definitely firmer but not bone-rattling. On the positive side, the skid plate no longer scrapes on steep driveway-to-road transitions. On the negative side, the rear springs don’t handle a load as well as the old ones. When fully loaded in back, it’s definitely lower than I like.
Front to back (think washboard) ride is good, even on Michigan’s rotten winter-damaged roads. But there’s a surprise: where the road is uneven side-to-side, I definitely feel my head snap back and forth (left and right) more than I used to. Not sure which change is causing that – the springs & dampers, or the TT bushings?
If I were to do it all again, I would probably choose a different rear spring.