IMO, $650 is too much money for what you are getting. Can you link the package deal so we can look at it? The one I found that was $570 without shipping will need to be upgraded. I personally do not believe that it is cheaper to buy these things packaged like this (regardless of whether HTG says it's worth $800, it is not).
The package I looked at came with a batwing reflector, which would need to be upgraded to an air coolable hood or cooltube. It also does not come with a "real" exhaust fan. It comes with an inline duct booster fan (shame on HTG as this is totally inadequate). The oscillating fan is a tiny clip on fan that goes for under $5 most places.
These are just examples, but will give you an idea how much cheaper you can put this package together yourself--you may find better buys. The tent, light, timer, yo-yos, fan and filter I have linked go for $456.00 and you have far better products--a cool tube, and a real centrifuge fan. A duct booster fan is totally inadequate to use at all, but even more so if you try to couple it with a carbon filter. I encourage you to look around. I have never ever seen a package deal that was actually "a deal".
I would recommend checking out buying things "ala carte". You can get a tent for under $150. I am looking at one on Amazon that seems pretty heavy duty and is under $140. The tent offered by HTG is actually 47 x 47, which would prevent you ever being able to use a 4' light if you wanted. You should also be able to get a 600W digi ballast with an air coolable hood or a cool tube for $200-250. You should be able to get a centrifuge type fan and carbon filter for around $160.
Tent-hXXp://www.amazon.com/Large-Hydroponics-4X4X7-Reflective-Mylar/dp/B0078P34A8/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=1HHYPCL51QYFW&coliid=I1WDUT9A34VEFH
Light-hXXp://www.amazon.com/Grow-Light-hydroponic-Dimmable-Pressure/dp/B005HB3L6W/ref=sr_1_4?ie=UTF8&qid=1350832745&sr=8-4&keywords=600w+hps
Fan/filter combo-hXXp://www.amazon.com/Hydropronic-Inline-Carbon-Filter-Control/dp/B002ZJNW3Q/ref=sr_1_1?ie=UTF8&qid=1350833201&sr=8-1&keywords=CARBON+FILTER+FAN+COMBO
The total for a 600W digi in a cooltube, a 4 x 4 tent, a 440 cfm centrifuge fan, a carbon filter, yo-yos, and a timer is just over $450. The other things in the HTG package can be picked up fairly inexpensively. I personally have never seen a package deal that was actually "a deal". You are paying a chunk of money to have someone else put the package together. It took me about 5 minutes to find better buys.....