I would take the philips over solis even if the solis was free, lol. unfortunately they dont make a de, but their allstarts with a proper square wave ballast are gonna run better anyways and be similar in price if not way cheaper, depending on ballast source and type of course. I'm sure
@ttystikk can help you out with the best ballast to use for whichever allstart are thinking about. Keep in mind too, if you dont mind burning a few extra hundred watts, an 860 allstart can run on a 1kw mag ballast which most of us have lying around, and those that dont can get one for under $50