Need an AM transmitter Recommendation

[Kico]

I have volunteered to setup an AM transmitter for our church and need some recommendations for a decent transmitter.

I have little experience with these and need some advice as to brand, product satisfaction and real world use. Needs to cover an area of about 6600 sq. ft and be able to transmit from second floor of a two story building...probably a maximum of 500 feet in any direction. Sound quality is important.

I have been looking at:

http://www.sstran.com/ and

http://www.ramseyelectronics.com/hk/....asp?page=amfm

Just want to be sure I not missing something...thanks for any advice or experience.

My apology if this is in the wrong forum. Moderators--if post needs to be moved to another forum please do so.