2wd 5 lug offset help

Ok, i can figure out almost any backspacing on a RWD rim, but the whole FWD rim on a 2wd Tacoma throws me. I have the ugly ass 15x6 steelies and want to upgrade to 17 or 18s. i know the Xrunner is a 18x8 30mm offset, now i want my rims to go out alittle more towards the fenderlip. do i get a 18x8 with MORE or LESS of a offset...and i want a POSITIVE offset, correct? so if i were to order 18x8 with 20mm POSITIVE offset, it will push the rim OUT towards the fender more???

i see ALOT of 5x114.3 rims i like ranging from 7.5-8.5 wide, i want the narrower rims for a 245 45 18 (or equivalent 17") or as close to OEM diameter as possible. with a 245 id like to stick to the 7.5-8" so if anyone can speak up about the offset i think i need/want, id appreciate it. as the offsets change my selection narrows ALOT....most are 18x7 with 30mm...i also would consider stock Lexus spoke rims and/or any OEM style rim...RX8 but want it to give a wider stance. im going to lower the truck 1.7"/2.2" with the sittinsic coils and leafs (maybe blocks first) so rubbing shouldnt be an issue. thanks in advance everyone.
Ron
92 miles on the taco and loving her (radio sucks though...static)

 

xrunner wheels on my 5 lug are flat with the fender, running less offset will make them stick out more like you mentioned

 

I think those wheels look very good. I think that if you go with a low profile tire without dropping the truck it wont look too good. Im running 235/55/18 it altered the speed a bit but not a huge difference. Here is a pic if it helps http://nitropr.net/misc/tacoma/IMG_3149%20%28Large%29.JPG

For reference our stock wheels are 15x6 with +45mm offset and the X-Runner wheels I think I saw a mark behind mine that said 18x7.5 and 30mm offset. I think those wheels you posted should be close if not flat with the outer side of the fender

 

Would wheels with a 18 offset fit on my 5 lug?