I have two similar domains available, but can't choose the best one. Anyone care to help?

I've found a good niche product. Lets call it the Nissan Skyline Drifter.

nissanskylinedrifter (com) and nissandrifter (com) are both available (sorry I can't post proper links yet). All other variables are good, i.e. CPC is high, allintitle searches are low, plenty of sales through my chosen advertiser etc. Also, the top 10 in Google for each keyword are almost identical with relatively weak competition.

Nissan Skyline Drifter has 1900 exact match searches per month
Nissan Drifter 1600 exact match searches per month, so quite similar

I seem to face a few options:

1. Register nissanskylinedrifter (com) as thats technically what the product is called and has slightly more exact match searches

2. Register nissandrifter (com) as it's shorter (so arguably better SEO) and easier to remember / type in. Although people don't really call it the Nissan Drifter..it's really called the Nissan Skyline Drifter.

3. Focus on one domain, but register the other and auto-redirect it in case someone manually types in the URL. But again, which domain is better?

4. Build two sites. One a sales site. One a review/article site to feed to the sales site. Although this would double my content creation, backlinking etc and I may loose clickthroughs from the review site.

I'm a bit stuck. What do people think is the best option, or can you see alternatives

Thanks
Bryan