Dear experts!
I want to upgrade my sound system on my HTPC.
Currently I use:
Logitech Z-5450 5.1 Wireless Speakers
http://www.pcmag.com/article2/0,2817,1904833,00.asp
I want to start replacing parts of the system with better speakers and amplifier. I cannot buy all at once due to budget.
Do you think I'm crazy If I buy 2 front towers as a first step B&W CM8 and attach them to Logitech amplifier
instead of current small Logitech L&R satellites.

Logitech amplifier is:
Total RMS power: 315 watts RMS
Tech Specs Satellites: 199 watts RMS (2 x 38W front, 2 x 40.5W rear, 42W center)
Tech Specs Subwoofer: 116 watts RMS
Tech Specs Total peak power: 630 watts
Tech Specs Maximum SPL: 103 dB
Tech Specs Frequency response: 35 Hz - 20 kHz
Tech Specs Input impedance: 9,500 ohms
Tech Specs Amplifier: Ultra-linear high-capacity analog
Tech Specs Drivers: Satellites: 2 1/2” aluminum phase plug driver
Tech Specs Band-pass subwoofer: 6 1/2” high-excursion driver
Tech Specs Surround sound effects: Hardware decoding for Dolby Digital, DTS and DTS 96/24 soundtracks
Tech Specs Dolby Pro Logic II (Movie and Music modes)
Tech Specs 6-channel direct
Tech Specs Supported digital formats: Dolby Digital, DTS and DTS 96/24
Tech Specs PCM (uncompressed stereo): 44.1 kHz/16 bit through 96 kHz/24 bit
Tech Specs Source inputs: (2) Digital optical for DVD or CD players, PlayStation2, Xbox, or PC sound cards (requires optical cable, sold separately)
Tech Specs (1) Digital coaxial for DVD or CD players or PC sound cards (requires coaxial cable, sold separately)
Tech Specs (1) 6-channel direct (3 stereo-mini connectors) for 2, 4 or 6-channel PC sound cards OR
Tech Specs (3) stereo-mini connectors for 3 stereo analog audio sources, such as CD and DVD players, PlayStation2, Xbox, or 2 channel PC sound cards (some devices may require stereo mini to dual RCA adapter, sold separately)
Tech Specs (1) Analog stereo-mini (on side panel of control center) for portable CD, MP3, or MiniDisc® players