Have to agree on the Impact. Fantastic gun, but, perhaps too much first time out. I still think the biggest thing to do is find a shop with some on the shelf, and drive to that shop if at all humanly possible. A couple hundred miles to touch and hold something you'll spend $1000 or $2000 on seems a small price to pay.
I drove to Utah Airguns a few weeks ago in Mapleton UT (a bit over 100 miles round trip for me) and they let me hold several FX guns including the Impact and shoot the owners personal .25 Royal. Really didn't like the feel of the Impact. Streamline actually felt lots better, then he handed me a Royal. Love at first touch. It was a noticeably different experience shouldering a Royal over the Streamline and I thought that the Streamline was MUCH BETTER than the Impact. The Wildcat was OK to shoulder, but I'm not used to bullpups, so it felt odd. I'm sure I could get used to it, but traditional rifles are more my style.
In buying a gun, back to the basics.
1. what are you using it for. Hunting can take a completely different gun than Extreme Bench Rest.
2. Budget - What can you spend, and don't forget the support system of pumps, air tanks, compressors and the rest. That part adds up fast.
3. How advanced are you? Do you shoot Powder Burners and love a god trigger over all else? Then you better find a gun with a good trigger or you'll hate the experience.
4. Optics. What do you want in a scope? I have a 4-14 x 44 FFP. Fits me perfectly. You are probably very different.
5. Range you want to shoot. If it's under 30 yards, the Maximus is plenty to plink, and punch paper, though it has a crappy trigger. If you want to shoot 100 plus yards and drive tacks, then a Royal or something in that class may be what you need. Oh, and 10 meter competition shooting requires a completely different setup.
Example of specific use, Ted's Holdover, Ted has a Streamline tuned down to 9 foot pounds energy so when shooting on a cattle operation, the pellets would bounce off the tarps protecting silage instead of poking holes in them. That's not a normal use, but it sure makes sense in his case.
If this is your first PCP, and you buy an Impact, you can easily drop $3000 to set it up. $1999 (OK, $2000 for round numbers) for the gun, $500 or more for the scope, $70 on FX scope rings (No Limit rings) and a 90 Cubic Inch tank is $350. That doesn't even buy any pellets at $15 per 500 or your first air fill on the tank. Oh and I forgot the Atlas bi-pod for $300 or $400.
A streamline with less expensive components could drop that by half, and a Marauder could drop the Impact investment by 3/4.
Just so many choices out there, you gotta do a bit of research and get the best feature set that is a good compromise for your own goals
As everyone here probably knows, I am a fan of Prototyping, or buying less expensive and working into the dream gun you want. In my case, I have a Marauder and am learning, and saving for a new gun, and will probably buy a Royal or Crown if it's available when I'm ready to buy. Interchangeable barrels sound cool, but once I had one that worked, I'd never change it, so changing barrels isn't really needed. After a couple years with the Marauder, I feel much more comfortable with my decision to go after a Royal or Crown , as either will have the features I want for my style of shooting.