Hello :-)
As far for as telescopes on Amazon, the Skywatcher 8" is the best deal (cheaper, better finder than the xt8; and the sw6 has a better focuser than the xt6).
A 2" wide-angle 30-38mm overview eyepiece ($70+) and for planets possibly a 6mm "gold line" (Corvus optics or at Amazon 35$, ebay/china $22). Ideally also the 15mm for deep-sky.
Sadly the Zhumell z8 is not available via Amazon, it's accessories are great (already includes a 2" 30mm 70degree eyepiece, dual speed focuser, right angle finder, moon filter, laser collimation tool...)
Else something like "turn left at Orion", dim red light and ideally a height-adjustable chair.
Difference 6"/8" https://www.reddit.com/r/Astronomy/comments/3j2wjo/what_is_a_good_telescope_in_this_budget/cum0622
//edit: added some links
edit2:
SW 8"$355
Gosky 6mm from Amazon ($35) or ebay/china gold-line ($23)
A 2" overview eyepiece (benefits), $70-$110
ideally, also a 15mm
=> ~$425 with the two gold-lines, or $467 with 6mm+2"30mm, but you could skip the 2" wide-angle eyepiece for now. It will still show a lot more than a 6". You can allways buy more eyepieces, but not upgrade aperture. It's the bottle-neck of a telescope.