We have a replacement Thermopride furnace wirth a Beckett burner which has been great(no service needed other than routine cleaning ) and have added a Carrier top of the line A/C which has been working very well.
The secret is to get a good installer who is very compentant in installing any good quality unit an standing behind the installation. Beware of buying the low cost installation-the old addage "you get what you pay for" really applys here.