all the tripplite switched units ive seen are costly as can be or a measly 20a whih gets me nowherfe in terms of roi
as for tripping a breaker with a servo you are only tripping the breaker for one of two reasons
1) a unit needs a hard reset. aka trip the breaker and reset all easily just like if you unplugged and replugged in the pdu
2) there is a problem you see remotely and throw the breaker as a saftey precaution
The TrippLite ones I bought was on the secondary market, and older PDU's are generally cheap cheap cheap. The ones I've got are 30a, which pairs fine with the outlets I'm using. The problem I've got with the TrippLites is the web interface routinely stops working, and they only put relays on half of the 240 circuit - so if your PDU is 110/120v tolerant, it will still keep running on half a leg - super annoying and really cheesy on their part.
Personally I love (and use) the idea of being able to remotely cycle outlets - but I draw the line at remotely resetting breakers, that just seems like a bad idea. But if you're using server grade PSU's, you can easily power cycle those (see below).
sorry but what do you mean about "#2: CT on each outlet."
CT = Current Transducer - so you know how many amps each outlet is pulling...
SSD + rpi done deal
You wouldn't need an SSD, just use the MicroSD the RPI uses...
If you're looking for just a cheap/ready made solution, you could use an ethernet relay box, like these:
http://amzn.to/2bCPHkuI used them before, and almost all of the breakout boards have a pin header as well as a power switch, so you just hook up the relay to the power pin header and voila, you have 8 switched breakouts.