I would go with Wayne on the .25 Marauder......and for just a little more over your total budget pick up a .22 Marauder pistol/carbine(PRod).The Marauder rifles are super accurate, but very heavy, so its great for bench shooting or hunting off a bipod or shooting stick. The Prod is super lightweight and compact, but still packs enough power to easily take down squirrels. Wayne can attest the effectiveness of pesting with a PRod.
Its funny when someone wants best pcp advice for a .22 and everyone gives .25 cal suggestions For under $700 and .22 I would look at BSA scorpion se.
Marauder .25 through crosman with AGNATION promo code is 473.19 with tax and shipping.
Long time powder burner and hunter looking to get into PCP for the first time looking for 22 cal small game hunting, casual target, and plinking. I have had springers for years as well as multi-pump pneumatics. Always had a dislike for the more powerful springers, barrel droop, recoil etc. As I have access to high pressure fill stations I do not know why I have not jumped into this already. So recommendations for first PCP rifle please