The 353 is no occassional saw, it's a PRO class saw, better than the 260 in all aspects. The only reason it is listed as occasional is because they want the pro's to buy the 346xp. There can only be one XP saw in each cc class. The 353 is just as much quality as the 346, just less power (which does not negatively impact the durability of the saw).
The 346 is THE 50cc saw, 2nd is the PS5100, third is the 353, fourth is the 260.
BTW, iif you plan a 361 I can't understand the need for a 50cc saw.
One saw = 60cc = 357/359/361
Two saws = 50cc + 70 cc. = 346+372/576 or 260+440/441
+1. 353 and 346 are the same saws with a different piston and cylinder from what I understand.