Personally Jas, I feel you're proposing way too many eyepieces. While we may tend to accumulate them over the years, if you're going to take the plunge with premium eyepieces then do it one at a time and be targeted as to which focal lengths you buy.
If I'm honest, I rarely use more than 2, sometimes 3 eyepieces in a night, but I have a small collection because I have telescopes with (very) different focal lengths...from a 71mm f/6 refractor to a 280mm f/10 SCT. Even then, I've bought them semi-strategically so I can get most value out of the high value purchases. I'm also not a big fan of using a Barlow with bigger eyepieces because of the extra leverage! That doesn't mean they can't be used securely, just that I'm paranoid about the extra connection and having the precious glass fall to the ground
I'd agree with Adrian that the 13T6 Nagler is a great eyepiece, it almost has it all, nice wide view, pin sharp and it is compact and lightweight. But I'm not sure it's a wildly useful focal length if you're starting out with a new collection. I'd suggest a 9 or 10 mm, giving you 150-170x which is good for globular cluster, some planetary nebulae and planets themselves if the seeing ain't all that great.
You'd probably want something to give you higher magnification but I'd suggest trying the more useful focal length first, and if you get on OK with it you could get a shorter focal length of the same design for the nights of better seeing (if you don't see that as too frivolous of course). Or pick another design that is appropriate for the task. XW and Delos are great for planetary, but so are little orthos (at a fraction of the price) and beastly Ethoses
(at double the price!)
Then there's the wide field view...the 31T5 Nagler is a fine eyepiece but at a fine price too
the Explore Scientifiic 30mm 82 degree is within a hair of the Nagler and half the price. I know I'm not alone in here for lovin the views from that eyepiece
