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hi Daniel
Thought that I may add my 2 cents worth. For several years I used an 127 x 1200 achro on an EQ5 mount with dual axis drives for lunar and planetary imaging with a Toucam webcam and managed , on nights of steady seeing to get some acceptable images of Jupiter, Saturn, Mars and the Moon. Personally I would recommend using an webcam style video camera for what you want to do rather than a DSLR in video mode and don't cost much and there is plenty of freeware to help with capturing and processing.
As for image scale, even with the scope you have and the 2X barlow, which gives 2400mm f/ l even Jupiter at its closest,largest apparent diameter will appear on your monitor screen at about 30 / 40 mm in size.
If you have polar aligned and focused carefully and the seeing is good and the timing right you will be able to see cloud band detail and the Red Spot and shadow transits of the Galileon satellites. The rings of Saturn with the Cassini Division and some of the more prominent surface features of Mars can be captured as well.
I still use my 127mm achro occasionally for video captures when I am too lazy to get one of my better scopes set up though I have a better camera with faster frame rate now which helps beat the seeing. The achro will give some misaligned colour to the image, for me it meant that after stacking in Registax there would be a blue fringe on one side of the planetary disc and a red fringe on the other side, but this can be alleviated somewhat with the colour alignment tool in Registax. Other software like Photoshop will improve the image processing results as well. All part of the fun of learning the tricks of the trade.
So don't be afraid to use what you have and not to expect instant success
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