With most marathon training schedules being around 16 weeks long, I guess there'll be a lot of thought into which one to follow. I used Hal Higdon's 10 mile schedule for the Great South Run and it worked great for me. On this basis I think I'm inclined towards using his for FLM too. One good thing about his website is the fact that you can click into each week and find words of encouragement and support.
Regarding speedwork, I think that at this stage it's more about getting miles under your belt, and the speed will come naturally. A comment has been made on here before - why get to the finish line only to be disappointed that you came in at 4:30:01?! For me it's about getting round and completing my first marathon, I chose this thread because I know my long run pace fits in or around the 4.5 hour mark, but 5.5 hours would do me fine!
That said, HH's schedules have at least one 'short' run a week. As the miles build up you will invariably use this run to try a new pace or simply just run a little faster so you feel like you've had a good run in comparison to the longer ones. This training technique seems to work for me - from being over the moon about running 5 miles at 11 minute mile pace, I did the Nike 10k in 55 minutes, and the Victory 5 on Sunday in 42, so improving all the time. I'm currently doing 3 runs a week, one short and fast, one middle of the road, and one long and slow. Add a 5 a side game to that and I think I've found the best way for me to train…. so far!!