How much "just" under 1.5k? That should be around £1300. You're also missing a PSU.
I'd swap the X570 AORUS Elite for an X570 TUF or X570 Tomahawk. The Tomahawk is a better mobo, the TUF has a better BIOS. The Asus TUF isn't necessarily "better" than the AORUS Elite, but it's not worse either- the Asus BIOS and features are all that give it the win over Gigabyte in this case IMO. All 3 are fine, but Gigabyte would be my last choice of the 3. Don't get any MSI X570 mobo's other than the Tomahawk.
I'd spend an extra tenner for a 1TB Sabrent Rocket Q over the Crucial P1. If prices change by the time you buy everything(if you're not buying right now), then the P1 might make more sense again but at current pricing, get the Rocket Q.
I'm assuming the Crucial Ballistix RAM you're looking at is the RGB stuff for 90 quid? If so, that looks like it's 3600MHz @CL16 which is really pretty damn good, so yeah if you want some RGB RAM that's a solid option at that price.
If that's not the kit you're looking at, I'd be concerned with what the price and latency of the kit you are looking at is.
If you really like the NZXT H510, then you're going to get it, but I wouldn't. Phanteks Eclipse P400A and Cooler Master NR600 are both similarly priced examples, that will have much better airflow and are just better cases than the H510. If you're set on the H510 and really like it though, it'll do absolutely fine with this set-up.
RSL wroteI am tempted to go for the ASUS X570 but I hear the Aorus is better..even a MSI B450 but i feel the x570 chipset suits the 3700x.
I wouldn't bother with B450 at this point, personally. B550 will be available to buy in like a week. B450 will still likely be useful for tighter budgets, but when you're spending £1k+, it doesn't make much sense.
RSL wroteAlso, i am only moderately gaming at 1080p and have a 144hz monitor. Although I am not fussed about FPS as long as I remain above 60FPS. Therefore, is it worth saving around £80 and getting a 2060 super? Or even a 2060 and save £180.. opinions?
An RTX 2060 would be fine. Although, if it were me, I'd really be getting an RX 5700 for 1080p144Hz. RTX 2060 Super/2070 will match 5700 performance and give you RTX and DLSS.
RTX 2070 Super is a 1440p144Hz or 4k60Hz GPU all day, no need for a 2070 Super @ 1080p144Hz IMO.
RTX 2060 Super and 2070 are priced almost exactly the same still for some reason, so I'd just get a 2070 and skip the 2060S. Obviously it depends on pricing when you buy though, so just keep an eye on both when you're looking to buy in case you find a really cheap 2060S.