Seems we went a bit off topic, so lets get back on.
If you want to get a case I would stay away from the lanboy unless your friend does alot of LAN parties and doesn't want a hernia lugging the system around.
As for the Sonata, it is a great case (currently using) but it will run a bit hotter then others, mainly due to the positining of the front FAN. As an alternative I would look into the soultion series Antec cases the SLK3700AMB. The design is similar to the Sonata, with the exception of the HDD cage and the the intake fan. It has a weaker PSU but it is still good and it costs you alot less $$.
As a side note I would purchase two Enermax 120 mm Speed adjustable fans for the case if you go with the SLK3700 or the Sonata, and either a Thermalight SLK-900U or SLK-947U HS with an Enermax 92 mm Speed adjustable fan.
At the monent my system has these, and the fans are set to lowest RPM. My system is no lounder then my PS2. My temps are avg 40 deg C for CPU (1700+) and 38 for system at 25 ambient.
These are for avg usage, net, watching movies and playing Diablo II.
As for cables I have Antec Cobras in my case. You don't really need them but hey they were a present to me, and are only $4 more expensive then majprity of others out there.
GL with the case purchase