What is a rugged PCP rifle on the low end of the price range?

To my mind, Benjamin Marauder or Armada. They are sturdy, easy to work on, parts and upgrades relatively cheap compared to others. Great warranty and support. These are mine. One is a Marauder, the an Armada, both .22, and as you can see, neither is in factory dressing. I bought the Armada off Amazon last year. It came with bipod and 4-16×40scope, both decent. It is on there now for $669.00 and compressor was under $300 for 4500 psi with adjustable auto shutoff. 
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Meet Thelma & Louise, one under 20 fpe, one at 35 fpe.

+1. I totally agree!
 
I had the JST Standard and MAX .25s in my hands for a few months now,

the Standard is definitely a simple rugged gun, Barrel is threaded into the reciever, metal magazines, 50 FPE out the box and easy to tune up for an other extra 10 FPE, very easy to detune for lower powers by adjusting Hammerspring, 5 position transfer port adjustments and even Valve spring adjustment.

For 300 some bucks definitely would classify for low end price, definitely rugged and also powerful.