If you're doing anything 10 gallons or less, I question the need for a conical. I say this as someone who *had* to have a conical, and had the budget to buy one, but decided in the end that they are more about 'bragging rights' at the homebrew scale than anything.
Regarding the supposed 'advantages' of conicals:
Can move beer under pressure: I can do this with any vessel that will hold the relatively low amount of pressure it takes to move beer.
Off-flavors from sitting on yeast: This not necessarily proven in the homebrew arena. Award-winning beers are brewed in plastic pails all the time.
Yeast harvesting: As far as I know, yeast does not care whether it leaves the vessel through a downward-facing spout or not. At any rate, I am planning to have a proper yeast library and probably won't be repitching yeast anyway.
Conicals are also more delicate due to the legs required to provide clearance to the valves. Also, it's just as easy to attach tri-clamp fittings and rotating racking arms to a cylindrical vessel as it is a conical one.
Regarding the temperature-controlled nature of the MoreBeer! conicals, the above poster was right in that they are limited in how much control they can provide in a hot room. Also, the type of fans they use are prone to failure.
Most important to me was also the fact that I'd like to have multiple ferments going on at once - and that requires multiple fermenters. That gets expensive, fast. Also, the argument of doing secondary in a conical without moving beer to another vessel is interesting, but you're tying up an expensive fermenter for that much longer.
I personally am working on tracking down 1/2 bbl Sankes for conversion. I may TIG the fittings myself, but even taking them to a welding shop shouldn't be that expensive. Even buying new kegs at $150/pop, I can be in a fully stainless fermenter with tri-clamp fittings for less than half the price of a conical. Plus, I can easily put multiples in a converted chest freezer without worrying so much about damage to legs.