You should be fine now. All current ones sold now should be Jasper. Also remember Microsoft has extended the warranty for 3 years.
If your in the UK you should pick it up at that retailer that is discounting the 360 even beyond the price cut rate.
Even though you don't think you need a HDD I would at least pick up the Pro, because you may want it in the future, I don't do much online gaming but it is convenient for downloading LIVE games and demos.