Just to echo above post, a mid 2012 model should be more than adequate to run those applications- particularly if you are running an SSD and 8GB RAM. Unless you are set on getting a newer model anyway, I would suggest investigating what might be the issue- A logic board replacement is perhaps the only thing that would not be worth replacing as far as cost of repair vs the value of the laptop.
That said, sluggishness could likely just be an OS issue or the SSD. The Apple store can run a free diagnostic for you and likely identify the issue.
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