Barry, I'm not recommending the computer type based on Gliderscore, or any possible program. It's the operating system that causes fast when new computers to become too damned slow to use paperweights.
Imagine that your new car came with an invisible trailer, and every time you stop for fuel some arsehole tosses a brick on it. Oil changes, tune ups, new tires also come with free bricks.
Computer program updates, security patches, anti-virus et. all are computer bricks.
In this case, if it can't be done within a reasonable budget, do an i5 CPU, but don't compromise on the memory.
JD