FWIW: I've been investigating a number of "low-cost" hubs that can
be powered but may not be supplied with a PSU, mainly because some supplied PSU's are of poor quality (this, as also noted in the wiki, seems to be often the case for generic 7-port hubs). The details can be found at http://www.cpmspectrepi.webspace.virgin ... BHubs.html
(and other pages within my website). Most of the time I use either the hama or Targus hubs (the Gembird switching hub is almost permanently used to share a wired keyboard and mouse between my netbook and one of my Pi's - this is effectively "powered" by the netbook). I rarely use the hubs "powered externally" - I found that a model B Pi would work quite happily with, for example, a wired mouse, wired keyboard and USB stick via the hub and a second USB stick in the Pi's other port, so long as the Pi was powered by a good 5V 1000mA PSU
. One thing to wary of, however, are devices using "Y' cables these do not work with lower-cost hubs since all the ports appear to be connected in parallel and, hence, nothing is gained via the second "power only" leg of the "Y". IMO such devices work best if separately powered (if they have the capability) from their own PSU.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, A+ and a B2) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm