#2
Check the radius of the F/B before you do ANYTHING ELSE.
Current Gear:
LTD MH-400 with Gotoh GE1996T (EMG 85/60)
PRS SE Custom 24 (Suhr SSH+/SSV)
Ibanez RG3120 Prestige (Dimarzio Titans)
Squier Vintage Modified 70s Jazz V
Audient iD22 interface
Peavey Revalver 4, UAD Friedman BE100/DS40
Adam S3A monitors
Quote by Anonden
You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#3
I have no idea what the radius is. This is the guitar http://www.ibanez.com/eg/guitar.aspx?m=IJX20 . Here's a chart of Ibanez necks http://www.jemsite.com/jem/necks.htm but the GRX is not listed on there. Some sites I saw said 9 1/2'' some said 12'' which seems ridiculous. So I don't know.
#4
make a set of radius gauges-all you need is a ruler and a pencil.
Current Gear:
LTD MH-400 with Gotoh GE1996T (EMG 85/60)
PRS SE Custom 24 (Suhr SSH+/SSV)
Ibanez RG3120 Prestige (Dimarzio Titans)
Squier Vintage Modified 70s Jazz V
Audient iD22 interface
Peavey Revalver 4, UAD Friedman BE100/DS40
Adam S3A monitors
Quote by Anonden
You CAN play anything with anything....but some guitars sound right for some things, and not for others. Single coils sound retarded for metal, though those who are apeshit about harpsichord probably beg to differ.
#6
The radius of your fingerboard won't influence your nut choice, because the nut sits on a flat section of the neck, independent from the f/b. Granted, you might need to play with the slot depths if you have trouble with the action on the first few frets.

Any 43mm x 6mm nut should do the job.