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Ill add stay away from short focal lenght newtonians, you do not want an f4!, it will send you nuts colimating and is more of a specalised length. look for F6 ish, do not buy a "high end professional" anything the ebay ones are "low end toy's" and a real one is hugely expensive (think over $20k )
Long focal lengths arnt an issue as such, refractors are normally longer and there is nothing wrong with F9/10 in a 4.5" or 6' if its a good one. As for apature a real crappy 8" wont be as much fun as a really good 6" you do get what you pay for and its the mirrors you should be worried about, other stuff can be upgraded later comparitavely cheaply. The bintel 8' F6 is probaby THE beginner recommendation. They do pop up second hand.
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