I hate to see a question like this languish, so here's my 2-cents:
Pressure and flow-wise it looks to be up to the task, but there's no details on what's inside the SS head. I know that PBW doesn't get along with aluminum and maybe some other materials. As far as Star San goes; Which school of thought do you go with: Simply spray the surface and call it good, or fill the keg completely to remove O2 and then purge? The latter is the preferred choice of most homebrewers as it'll waste a ton of CO2 in purge-cycling and air-filled keg as opposed to just displacing Star San.
Your potential pump choice has shown that you've at least given it some amount of serious research, as at least once a year we'll get someone who wants to start kegging, post a link to a cheap submersible pond-pump and ask if it can clean their Sanke. *-Those cheap pumps are perfectly adequate for a corny-keg cleaner and the leading choice...to whit; Have you considered using cornies which are far easier and more economical to work with?
We have a small but successful niche on here of DIY'ers that use sankes and in the last year or two there was at least one long and well detailed thread in which a member continually updated and debabted choices of parts, but I can't find it. Maybe someone else will have better luck. In the meantime, I hope the bump from this post will get a few more knowledgable-than-me members to help you out.