I've had the 303 for years and its in awesome shape...its just that my patience runs out waiting for it to think since I got the OG 404 and I haven't been using it. Lately, I have been losing tracks trying to load the CF card into the computer, so I am fiending after the 404SX, so I can make quick tracks and dump em in the laptop through the SD card slot. I also want to lay down some basslines in real time through the ext source while resampling from another SP. I have a CF card to usb adapter, but when I try and export wavs onto the card from the OG 404 and load the card through the adapter, it often prompts me to format the card. Then when I choose not to and try to load it back in the 404, it wont read anything and wants to format.

I dont want to get rid of the OG 404 as it kicks ass and I love the Vinyl Sim Comp (not found on 404SX)

The 303 has all the warm mojo and seems to be increasing in value. It is a modern classic.

The 404 SX is a bit pricey, but the card situation is attractive (however, no Vinyl Sim Comp).

I'd keep the 303 and sell the OG to get the SX. What ever you do its a tough decision. lol

Yeah, don't sell the 303. Save up for an SX instead and enjoy all 3 worlds. Many times I tried to sell mine, but its like I hear voices crying of tears and yelling "NNOOOOO!! Don't do that!" Then they bring a goat and slaughter the poor thing right in front of me . . . thats when I took it off ebay.