hey Bill ,
i understand your position perfectly , and thanks for the advice .
b spot - that link is extremely informative , and i'm guessing that it contains most of the issues that are mentioned here .
really guys - thanks again . this is where the forums such as this one are of invaluable help to guys like us .
i'll let you all know of my final decision , and will certainly post on the progress of my HT as it happens .
felix