In my case I only plan on flying scale....with the basic 4 servo setup (since I perefer WWI and WWII bi-planes most of which have fixed landing gear, etc.)

One more thing I forgot to ask is servo choices as someone else hinted at them. At what point (i.e. what engine size and wing span) do you need heavy-duty/ball-bearinged/metal-geared/etc servos in favor over your standard plastic geared servos that come with most systems? In my case I think the largest engine I plan on using will be a .45 cubic inch.