I don't know what the Dynavector costs in Australia; but in the USA it's a bit over your budget. I think the Denon DL-301 MKII is a better match for your RB250 than the 103R. I really like the sound of mine on a Sumiko MMT; but it's my first MC, so what do I know.
I think re-tipping the 501 would be a tad cheaper, unless you don't like it's SQ. In that case you could sell it and add the cash to your budget and get the Dynavector or maybe even something a bit better.
I think re-tipping the 501 would be a tad cheaper, unless you don't like it's SQ. In that case you could sell it and add the cash to your budget and get the Dynavector or maybe even something a bit better.