This is what I'm thinking about doing.
H61M/U3S3 Motherboard Upgrade:
Update BIOS to 2.40
CPU: From Intel® Pentium® Processor G850
(3M Cache, 2.90 GHz) to Intel® Core i5-3570K Processor
(6M Cache, up to 3.80 GHz)
Memory: From 4GB toCrucial 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
Drives: add another 120GB SSD to my existing 120GB SSD with 85.1GB free space and 650GB free space on my HD.
Also probably need to update power supply.