Have you think about using a mac mini as your htpc? Arstechnica wrote an article about Mac mini HTPC Followup: Core Skills, if you want to use a Mac mini as your htpc, you should check it out.

Here are price comparison between different htpc cases

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D-VINE MCE303 SILVER HTPC MEDIA CENTER CASE W/ IR & VFD    US $149.00

AHANIX MCE303 BLACK HTPC CASE W/ IR & ROUND VFD D.VINE    US $150.00

Antec Fusion HTPC Case - Excellent Condition    US $110.00

SilverStone LC10 BLACK HTPC Case /w Antec PSU    US $29.00

Brand new nMedia HTPC 5000B Blk M-ATX Desktop HTPC Case    US $60.00

Moneual MonCaso 312B HTPC Case Black Aluminum-EXCELLENT    US $85.00

Brand new nMedia HTPC 6000B Black ATX Desktop HTPC Case    US $73.00

Lian Li Black Aluminum PC-C32B ATX HTPC Case    US $66.00

AHANIX MCE302 SILVER HTPC MEDIA CENTER CASE W/ IR & VFD    US $102.50

NEW Thermaltake Mozart IPOD HTPC Chassis Case VF3000BNS    US $99.00

Bach MediaLab VB8000BNS ATX Media Center / HTPC Case    US $20.00

Ahanix D-VINE MCE303 Silver HTPC Media Center Case .99!    US $36.00

HTPC Computer Case - SilverStone Lascala LC02B - New    US $59.95

Antec Fusion 430 HTPC case with LCD and IR reciever    US $170.00

Custom HTPC Case with 7" Monitor Built In!!!    US $200.00