I also have a Beeman P17 and it's a great little gun. I compared the HW40 and Beeman side by side in the shop and there wasn't a huge difference in external quality, just a few tougher edges on the plastic in the Beeman but at around half the price of the HW40 I bought the P17 and gave the tougher edges a light sand with wet and dry.

As another alternative the Artemis PP700 is a great little PCP pistol though starting to push your budget by the time you get a pump as well (though my £30 one has been faultless for the past 6 months). It also doesn't have elevation adjustment on the sight.
Also consider the Diana Bandit pistol. Unregulated PCP but at £150 from Macavoys it's a real bargain, even with RFD transfer.
https://www.mcavoyguns.co.uk/content...ir-pistol.html