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Hi Jowel,
Congratulations on your decision. A fine choice of scope.
You may well need to invest in some accessories and you will need something to collimate your scope straight away. A telrad is a great investment regardless of the quality of your finderscope. It enables you to point the scope to exactly the bit of sky that you're interested in. Even a right angled rectified image finder can be a little frustrating. With a telrad you may not use a magnified finder all that much, but I use both.
I'd recommend that apart from instruments for collimating and a telrad, wait til you get and use your scope a bit before spending more money. Your eyepieces will be quite adequate and it's a good idea to wait to see what focal lengths you like and how much eye relief you want etc. There is not much point in thinking about eyepieces before you've got familiar with the whole thing.
For collimating, I started with just a laser and underestimated the benefit of a cheshire eyepiece for setting the secondary. The laser is good for sorting out the angle of the primary and the secondary once the secondary is in the right spot and is a very quick tool for recollimating before each session, but a cheshire will help you get well set up in the first place. So I'd recommend both.
Bob's knobs are good if you only have screws for collimating as they do on GSO dobs. I don't know about skywatchers, but you'll find out when you get your scope. all it will mean is that you use a screwdriver to collimate which is not all that hard. If you find it a nuisance then get the knobs.
If you have a dark sky I'd also wait and see about a shroud. I have not found one necessary, but I have a dew heater on my secondary.
A bintel observing chair is one investment that is well worth while.
Essentials?
1 collimating gear
2 telrad
3 chair
Everything else on your list - wait.
That's just my opinion of course...
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