Are we talking $USD here? 8000$USD is a lot and probably a waste too; getting a 1500$ system every year for the next 5 years will probably give you better results at the end of those 5 years that 8000$ right now.
Other than that, how long do you plan on keeping this rig? After that period, do you plan on spending that much on a new rig again?
JackNaylorPE's post made me think that yes you can splurge, but you can also do so in areas that don't loose value and that you could enjoy for the next 3-4 PCs. That here is a couple of alternate suggestions to JackNaylorPE's build:
why just 1 monitor??? Get 3 and put them vertically:
You could buy or build a NAS using RAID5 to put multimedia files and backups
Get a single 256GB C300 SSD instead of 2 128GB in RAID 0 (see explanation below)
Get a really good desk and chair, sounds stupid, but you will be much more comfortable.
I'm really not a fan of SSD RAID, it will make sequential read/write faster. but would probably leave random access as it is or even impair it depending on the size of the files. Moreover, if a single drive fail, you loose everything. Also, the 256GB C300 is already 50% better at writes than the 128GB model so RAID only adds the other 50%. Finally, with any RAID, you loose TRIM support, yes this thing has GC, but GC is no TRIM (see here).