Another new TD owner just joined.

Purchased mine in Singapore last week.
Device Info:

ROM Version: 1.35.871.5 WWE
ROM Date: 06/06/08
Radio Version: 0.93.25.NS26
Protocol Version: 52.26.25.09W

Generally very pleased with it, although I find it a little sluggish at times. Everyone who has seen it likes it.

For the past week I have read in depth both this forum and the XDA forum and as a result I am suffering from information overload!!

I know that if I ask the question "What is the best ROM?" it's like asking "What is the best car?" It is subjective and everyone has their own opinion.

I want to flash my ROM without making my TD a brick. Yes, I know the answer is to search but information overload has made me dizzy.
What I want to do is flash my ROM but be able to go back to the original if necessary.

Could someone please give me an idiots guide. Never having flashed a ROM before I am confused about signed, unsigned etc.

KISS please.

Thanks
Ken