Better equipment is better, just don't except it to "lift a veil" off your sound. It is an incremental and syncratic thing. When I moved from a Firepod - one of the first affordable 8X8 units - and the TC Konnekt 48, I could hear an improvement but not as much as I hoped. Playing old projects through it gave a marginal, almost imaginary boost. Once I started recording w/ the better preamps, projects did sound better, the more I managed to use those slight advantages. My ears and techniques got attuned to using it. It almost sounded like a pro studio recording. But it was only after bumping up the analog side of the input chain that I felt my home stuff was equal to a big studio sound. Not that earlier home brew sounded bad - it was just there was more clarity and defination to the acoustic stuff.
So it was really a feedback loop, where better equipment means you can better record stuff techinque wise, which makes it easier to mix, which makes a better song, and you start planning the next song around what you've learned.
If you plan to stick w/ recording, it almost always makes sense to buy the best thing you can afford. Because if you stick w/ it, you'll end up replacing your kit. Also, you learn that the entire chain is equally important, from mic to monitors. You'll miss out on some of the subleties of sound if your monitoring is not up to snuff, or your room is bad. The sound improvement, say, from the Forte from a Saffire will be there, but you can't take full advange of it with a cheaper mic. And it will take a lot longer to develop your ear for those subtleties.
There is also the point of diminishing returns. The Warm or ISA One preamp is just about as good as you are going to get preamp wise, tho you can spend a lot more money. One twice as much will be better, but at the margins and for certain things. A lot of times people spend the extra money because they know their old neve on vocals or guitar will work and they can dial it in easy and w/ confidence.
Unless you need to record drums, the forte might be worth the extra bucks. My only qualm w/ it would be the lack of digital in/outs to expand it. I was checking the specs out on it and saw that B&H in NYC had them for $390. That might have been an old price, but you might want to check. You seem to have gotten the itch and you can only scratch it.
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