China products really are your only option. Be careful to the wording in advertisements as well. When a company states that their product is assembled and designed in the USA the parts are still manufactured in china. The only difference is that the parts are made to the companies specifications. Most of the time people assume that these are completely US made personal vaporizers but it is not true. However, these models do tend to be tested for safety more.
http://www.Inhalerette.com is a good example of this. The inhalerette is certainly not for the hardcore vaper though. It does not have much throat hit but it has OK vapor production. The price tag is steep but the warranty is excellent. Their kits come with one battery but they will give you an extra if you request it. Also, if you loose the product they will replace it free of charge. They also sell their carts in weekly and monthly supplies. They consider 20 carts to be a monthly supply. They advise against refilling carts due to biological contamination but I do and have had no problems. I just boil my mouth pieces and carts. However, I too prefer the 510. I also like the 801 which is my most reliable and has the longest battery life without a mod. the 901 is pretty good too. I buy my 801's, 901's, and 510's from
http://www.awesomevapor.com. The customer service is great. I just do not find satisfaction in most of the personal vaporizers that look like cigarettes. In fact I have found that to the more a PV looks like a real cigarette the poorer the quality. Not sure why that is but it seems to hold true in my three years experience. I also recommend
http://www.esmokeronline.com for liquids. They are real good in flavor and are well marked including the production and expiration dates. Also if you use the discount code
technosmoke you will get another 10% off of your entire purchase. I do not work for any of the aforementioned companies or receive any kind of kickback but I have reviewed all of these products. I would recommend staying away from
http://www.esmoke.net though. Their ecigs and parts are real poor quality.