Must pull trigger-- quick arm help please

Thanks.
Really no possibility of audition.
Dyna 10x5 is the cart I will use, and Nott interspace the table.

But I cannot swing both the rewired RB300 and the Kerry counterweight at the same time.

I'd pick the modded 250.

Read the info on the OL website, on the 250 vs the 300, and how they each respond to mods.

I second the Incognito RB250. You can get a Mitchell technoweight latter for that arm, an easy 5 minute change. I just bought one of these arms and I'm loving it.

The 250 has better things added onto the basic arm. The bearings on the 300 were originally better than the 250, but by the time OL did the mods you are coming out ahead. Besides, TWL said to go with the 250.

The 250 also accepts TWL's HIFI mod and my VTF on-the-fly mod easier than the 300. Maybe not a big issue with a 10x5, but certainly a huge issue if there's ever a chance of using a lower compliance cartridge. I vote 250.