I have a gtx 1070ti duke and Im considering upgrading to the 2080 not the TI being they are out of stock and the 2080's are cheaper. I also am running an i5 8400 16gb of ram and a corsair rm series 750w power supply
Upgrading from the 1070ti while having a 1080p monitor will give you no performance improvement and no visual difference. The only difference between the two will be cost.
What resolution and Hz is your monitor? Do you find your 1070Ti lacking?
it's not lacking and currently im using a 75hz monitor 1920x1080. im just the type to upgrade and be minded that i dont have to upgrade for a long while. I would also upgrade my monitor as well if I did upgrade to the rtx 2080
Doesn't seem like a terrible idea if you are upgrading resolutions or not getting what you need for your 1070ti.
I am getting what i need but id like to upgrade because i kinda want to do a 3 monitor battlestation type build with nothing crazy. im talking 3 27in 144hz monitors that arent 1920x1080
Yeah you would want to upgrade your monitor. The 2080 is ideal for 1440p 144Hz. However it is hard to justify the the 2080 over the much cheaper 1080Ti.
Upgrading from the 1070ti while having a 1080p monitor will give you no performance improvement and no visual difference. The only difference between the two will be cost.