My 2 cents,
First, about wholesalers, in the computer industry you must go through suppliers like ingram micro, techdata, etc. Just about every technology dealer works with a wholesaler...even giants like Best Buy, amazon.com, etc. However, until your pushing $100,000 or more of product a year...you won't be eligable for discounts (and of course, not the same level as the big boys). As a rule, no manufacturer deals with end users, as it defeats their business focus of making the products...not shipping, handling returns, and invoicing thousands of customers. It's not that they don't care, it's just much more economical from the manufacturers point of view.
Second, the market is pretty saturated for online computer sales (no service), and your prices would be much higher than established competitors like buy.com, amazon.com, and newegg.com. Since you can't compete on price, I would be hesitant about investing a lot of marketing money in this business segment. On the other hand, some well targeted ads to a specific niche on Google PPC ads might bring in some customers...you do have a good domain name that might entice customers to your products. It would need to be targeted at the average joe user, because gamers and enthusiast most likely are aware of the large (cheaper) online sites.
Third, about your computer service business at LoweTree.com, I would wait until you ave built a few fanatically loyal customers as a base before you lease any strorefront. If you do decide that a storefront is required in the short term, make sure it has a good, well traveled location as to leverage your signage to make sure you get a good ROI. Also, most local customer's won't mind paying a few dollars more if you want to resell stuff to them directly...since you'll be manage the shipping, delivery, and setup...it's a value add for them (not just price as others have mentioned).
Lastly, kudos on your web design...it looks pretty sharp on both web sites at a quick glance.
Good luck and remember the number one way to grow your business is to always delight your existing customer base.
John
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Gilham Consulting
Advanced Microsoft Network Solutions
www.gilham.org