Every man has an an opinion or preference, and valid reasons for them.
I am going to give you a piece of advice based on 2 years of reading this forum. There are two very happy owner groups on this forum.
WSM (Weber Smokey Mountain) owners, its charcoal something you didn't ask about, but the fact remains the WSM is one of the best smokers made period. The WSM is used on BBQ contests all over the country, in fact the KCBS team of the year for 2009 did it with WSMs.
MES (Masterbuilt Electric Smokehouse) owners. There are a lot of them here at SMF and the majority love their MES. In fact one happy owner said the taste was equal or better than his stick burner.
Price, if you want to stay under $200 then a MES 30" model. At $250 you can get the 18.5" WSM. $300 the MES 40", $400 the WSM 22".
If you want to try the WSM but can't afford it there is a copy cat and so far the reviews are very positive and the price is very attractive. About $70, there might not be any left....