I am in the process of getting a wide angle lens for shooting landscapes and occasional architecture in 4x5. I can only buy one lens at this time, but would like to know your opinions on your experience with these lenses, and whether if i should go with a Schneider Super Angulon 72mm XL, or a Nikkor SW 90mm f4.5.

I currently use 165mm SA, 210mm, 400mm. I am thinking of getting a 72mm XL now, and down the road, may invest in a Schneider 110mm XL or 120mm SA. Also, do i need a center for 72mm?If i should go with the SW 90mm, then down the road, i may have to get a 58mm or 65mm SA to complete my lens arsenals. Thanks in advance for your help.