My personal sets are
Kingchrome - socket set (80% of the work I do I use this set)
Easy to handle, lots of sizes and light
Side chrome - socket set
Heavier stuff + Spart plugs etc
The good thing with these guys is the warranty.
You break anything (using it correctly obviously) and they'll swap it over free.
I've had both sets for about 5 years now and they are still going strong.
The small ratchet is starting to wear out (teeth) so I'll get that swapped over shortly.
The sidchrome handle spins freely but maybe that was because I smacked it with a hammer (whoops).
You will need the 12 sided sockets for ARP nuts and bolts so any engine building will require these bits.
I use the 6 sided ones for those stripped nuts and bolts that the 12 sided cant turn.
The Sidchrome stuff works well in presses etc also.
As for spanners/shifters. I'm using kingchrome
Get yourself the full size and stubby ones.
Also if you have hex nuts, get yourself one of these
SNAPON are the best indeed! but are so expensive its hard to justify!
Teng tools are decent also. They have nice sets available.
My advice is to wait a few months (end of financial year) and pop into a tool store. They always have specials.
This is where I always get my stuff:
http://www.totaltools.com.au/
Buy some good tools and you'll actually look after them. They'll also last you a long long time over the cheapies