My friend can get me a good deal on some wheels and tires but the wheels I want he can only get in 18x8. The ideal size is 18x9 right. They have 18x9's in the style I want but I'd have to get them at regular price. Would 18x8's look lame? Should I just save up for the 18x9's?

Do you not remember back in the day when Mustangs wheels were only 7"? I used to cut consistent 2.0X on 245/50/16 street tires and pony wheels on my old 5.0L LX with little effort on a crappy track. If you like the wheels and 18x8's is the only size their available in, then go right ahead and get them. You're probably not going to see a huge difference in how they perform with street tires anyway.