If you are using these commercially,may I suggest that this may be a very expensive way to go.I do protyping using pics but ultimately,anything that gets produced(I work in the toy industry) is masked on a much cheaper micro(the code is easily emulated on other processors).Especially for LED blinking where a cheapo,4 bit unit is usually sufficient.Do one prototype per product and then make an order for a masked unit.It could mean the difference of dollars per unit.Unless you are doing custom work or something with low quantity but it doesn't sound that way.-Keith