Upgrating our seminar room

Ultimate list for immediate purchase

1.  Camera: Tongevo with 20x zoom (~ $420) 
2.  Microphone:   Suphyee (~ $70)   
3.  Rack:  Furino (~ $30)
4.  Speakers:   Creative Pebble (~ $18)

We shall discuss a computer later.

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What we would need (ideas and finds): 

1.  Camera: Tongevo with 20x zoom, $420. 
[alternatively  Prisual  (30x zoom, good ratings)  $700]

2.  Microphone:   Suphyee, $70   
[Alternatives:  Lavalier 2 $110.]. 

3.  Rack:  Furino ($30)
[Tribesigns  ($110).  Which is more robust?]

4.  Speakers with a wide Hz range for the computer?  (< $30).   Creative Pebble?

5. MOST IMPORTANT:  A decent computer with HDMI output and a good sound card. With a variety of ports. And a good keyboard.  One that actually works.   ($1000 +  ?)  Our current computer behaves erratically, it takes sometimes 15 min before things are set.    

Any other suggestions or remarks?  (We have to read carefully the customers opinions).

A whim:  what about buying Maple (math program) for the seminar room computer?...