Am not so sure the Avtech route is the best one to take unless it will result in a licence and last time I looked (long time ago admittedly), it did not.
What you got for your efforts was a City & Guilds certificate. Now with that Certificate you can use (or at least could use) it as credit hours towards the FAA flight dispatcher course and do the shorter one thereby saving some time and some money, however, if you have neither then going straight for the FAA makes absolute sense.
Have Avtech updated their course recently? Removed all references and photos of 60's vintage aircraft?
All the best.