Well enjoy away. Cartridges are priced from 20 Quid to about $15,000. Yes, they get better to the $5,000 level that I have heard. But there are some really nice ones in the 700-1500 range and when you apply that $ to £ conversion the number goes down so that is a big benefit.
Cartridges are transducers, like speakers, converting one kind of energy to another. One takes stylus movement and makes electricity, the other takes amp electricity and makes speaker movement...sound. These are the critical parts of a stereo system. The amplifying, making the electrical signal bigger is the easy part. For this reason there are big differences in the sound of these transducers. Most hear much more difference in speakers than any other part of their system. Cartridges can be similar, as you have heard.
Put all this together and you can listen to the VMS for a while and get an idea of what you like and what you would like to improve in the sound of the cartridge and maybe there can be some guidance on what to look at. Of course, there is also the matching of the tonearm effective mass to the compliance of the cartridge to take into account. With a medium mass arm like the 3009 Series 2, you have a wide range of choices. In my system the Koetsu is a great midrange performer but is a bit light on the bottom and top. The Ortofon was thought to be bass shy but it really is an accurate tight bass and the Dynavector is a clean clear full range performer. So right now I'm using a ZYX borrowed from Mike, mounted in his Audiomods tonearm on a TD-125. This is a sweet sounding table. His arm and cartridge are here for fine adjustments we did a couple months ago as armboards on the 125 are interchangeable, allowing a swap to do such adjustments knowing they will be correct when the armboard is returned to his TD-125.
Listen and if you have opinions on the sound, things you like and dislike with the VMS, let them be known and then we can guide you to a good choice. Take your time, you want a better than £300 cartridge, there is a difference. Here is a review by an AKer of a nice Ortofon entry level moving coil cartridge. He is comparing it to some general entry level cartridges, under 100 for them to the 350 range for the Ortofon but he is talking about what improvements he hears using a Dual table with an integrated tonearm. You have a great table and arm circa 1970 that has stood the test of time and is still a performer today. Worthy of comparison to the multi-thousand tables available today. Maybe a 5k table will be better, it is that good. The table will get the most out of the cartridges you decide to use. Of course, I don't know much about the European only/mostly cartridges like the Goldring and other brands but vinylengine does know about them if you read more than one audio forum.