I think I got the Speedtimer for £530ish and the Arnie on a Black Frday deal for around £290 a couple of years later, so a fair bit cheaper than what the RRP is.
If you have your heart set on those or the others on your list, if you can save a bit of money to put down a decent deposit, then wait for the right deal to pop up, the zero percent interest PayPal deals mean the finance payments aren't too bad. I then overpay when I can to clear the balance as soon as comfortably possible and that gives headroom to do it again (should I wish). Obviously does depend what else you have going on. Some people can afford to bung that sort of money all in one go and that's what Seiko is great as it's not stupid money, but for the rest of us putting a plan in place is the best way forward to get the things we want. Good luck.