I have an Aragon 2004 Mk II with a Conrad Johnson PV10BL tube preamp and couldn't be happier. Speakers are Magnepan MG12. I also had good results with a Bottlehead Foreplay 2.
I've seen many others using the Aragon 2004/4004/8008 amps with tube pres and maggies so I would say there's no problem there. You could get a used CJ preamp for a lot less than 2K to see if it works for you without jumping in with both feet.
I've seen many others using the Aragon 2004/4004/8008 amps with tube pres and maggies so I would say there's no problem there. You could get a used CJ preamp for a lot less than 2K to see if it works for you without jumping in with both feet.