I have not owned newer variants of the 103 i.e. 103D, 103R, 103FLS etc., so I can't comment on these, but the standard 103, I have. Its hard to beat for the price
To think the newer variants are better than the standard 103.
As to MMs, not to advertise or anything, I have owned Clearaudio's entry level Alpha.
It was nice for the money.
I think that lists now for $300.
I have also owned a Sumiko Blue Point. Its an MC, but high output, so no need for a step up device.
You know me, I don't fancy giving reviews, but what I can say is that I liked it in some aspects, but its a different animal as compared to Clearaudio's Alpha. This one retails for $250.
I have tried some of the entry level Grados, the black plastic ones, and not the more expensive wooden bodies. OK na rin yun.
I think those range from $50 to $200.
There are tons of MMs now available at that price range, but I can't say anything about it since I have not owned, and tried them in my own system and room.
But IMHO, you will have a hard tme looking for something at the range of $300 to have better performance than the 103.