My brother put a plastic tank on his 250SX.
My cousin also bought this tank from this site for his 250SX. Looks like it might be the same but costs a bit more here.
http://justgastanks.com/product_info...oducts_id=1960
No complaints on quality or functionality. It didn't quite match the color of his Maier fenders though. So he painted the tank to match the fenders. I told him not to do it. The paint is starter to lift but its not very noticeable yet.
Personally I'd give plastic a try. Its so nice not to have to deal with rust and leaks anymore. Here's my cousins bike with painted plastic tank. Not a very good pic to show the tank though.

And here's my brothers with plastic tank.
08 Outlaw 525s
07 CRF70
04 Harley FLHRCI
04 TRX90
03 XR650R
03 400EX- XR650R engine
02 XR100R
01 Banshee
00 XR50R
00 XR70R
99 PW50
99 JR50
96,95 Sportsman 400
95 Xplorer 400
94 Indy XLT
87 Trail Boss
86,86,86,86,86 Scrambler
86 TRX70 x2
85 ATC350X
85,84 ATC250R
85 Red Tecate
85 LT50 x2
84 XR500R
84,84,84,84,83,82,80,79 ATC70
82,79 XL500R
83 ALT50
79,78,77,77,76 XT/TT500
76,75,74 XL70
72,71,71,71 SL70
72 Harley FX
72,71,70,70,70,70,70 CT70H
72 SL100
70,69 Z50