Your video running at 61C iddle is quite hot actually. For gaming i do think that it may get to 65 or 70 easily. Never let it get over 70 i would suggets. For the mobo and CPU, its fine.
Please consider the airflow regrading your graphic card. Probably some cables is blocking the airflow. Your case is absolutely fine.
DFI Lan party UT NF4 Ultra
AMD Opteron 146 2.0 Mhz @ 2.8 GHz
OCZ Gold Edition 2x512 MB DDR 500 timing 2.5-3-3-8 @ DDR 560
XFX GeForce 7600 GT 256 Mb GDDR3
Antec Lanboy Mini Tower Case
Antec True Control 550W ATX2.0 PSU
Maxtor 300 GB 7200 RMP SATA 16Mb Cache
17\'\' TFT Screen 12 ms