Eclipse Vibration

I am a new owner of a Eclipse Spydor 2005 and I have a inconsistant vibration at speeds over 50mph. I'm 300 miles away from the nearest dealer. I've had it in just a few weeks ago and they looked at it and said I had out of round tires so Good Year replaced all 4 tires and I still have the same problem. There has been 5 different tires stores that have spin ballanced the tires and Good Year did after the new tires went on. I'm tiered of the BS stories from the dealer telling me to bring it back. All of my milage is being put on to and from the dealership. All the tire delaers have found no sign of a bent rim either but not sure if they have looked for it. I'm wondering if an alignment would help? Or may be I have a out of round rim, I'm not sure just looking for some help. Thanks
Sean

Alignment should have been done when the new tires were put on. You may also have bad struts. Bad struts will cause the wheels to not turn right, causing uneven wear and noise. I got the same problems.

Get an alignment, or at least get it tested to see if it's needed. If not, then check the struts.

It would help your cause to post in the right forum, even though this is a general problem.

I second the alignment suggestion.

the convertibles always rattle and vibrate weird, mine does it and so does my friends.