Can someone help me decide between an amp and an integrated amp?

I’m looking to upgrade to Maggies, so I know I need more power than my Creek 4240 SE has. I’ve been recommended a Classe CAP-151 integrated for $800 and a PS Audio Stellar 300 which lists for $1500, but they are giving a trade in of full original value for your old amp (800), which is an awesome deal. I have an IFI Pro headphone amp for a preamp.
Is there an inherent value in having separates versus integrated? Is there a problem using the headphone amp as a preamp? Has anyone done that trade in deal, offered out of Boulder? The Creek sells for less online.
Thanks for your help!
Its elitist to acknowledge the fact that you can do better spending less by paying attention to details like power cords? Getting more for your money is elitist?

What seems to have you so worked up elizabeth is this:
No component you can name will sound very good just sitting there on its factory supplied footers with its factory supplied power cord and its factory supplied patch cord. That’s just a fact.

Well, that is in fact, a fact. Which in spite of what you seem to think is nowhere near the same as saying you are required to buy the power cord, etc. What it says is what it says. I find it helpful to try and read and understand what people actually say and write, and not stuff my made up prejudice into their mouths. YMMV.
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If you want to save space and possibly some money buy a good integrated amp with enough power to drive Maggies. With an integrated amp, you don't need to purchase interconnects for a preamp.
If you have space and funds then individual components are an option.
It's a matter of personal choice and no one but you knows what your preference is. I also should mention that I believe in the long run it's worth waiting in order to purchase components that are really good vs mediocre.
For example, this would do the job nicely:
I'm sorry to say I don't know if using your headphone amp would work as a preamp. I think we would need to know the specifics of the headphone amp. It would also be helpful to know a dollar amount you are willing to spend.
Hi not sure which Maggie's you intend to purchase and have no experience with the amps you mentioned but I did use a Parasound integrated with 1.7i and the sound was amazing.
I guess separates or integiverated just depends on the best available deal. Just be sure you have enough current to drive Maggies.