I changed from a Rega 300 to a Victor UA-7045 a few years ago & it was a nice upgrade. I have since changed arms a couple times. They do make a difference. You can still find the Victor's relatively cheap.
indeed, one of the best tonearms for the money today, so much cheaper than many inferior and more expensive new tonearms, the Victor UA-7045 is fantastic if you can find a perfect sample under $1k, i managed to find NOS in the box which is more expensive, but i like NOS. The used samples are normally under $750. Now using long version of this arm UA-7082 and love it! Just make sure the counterweight is not sag down in this position.