Martin Miller's is amazing. Best gin for a G & T, hands down.
For Martinis, I usually use Bluecoat or Plymouth. Both are fantastic. Old Raj is also extremely good, though a little pricey.
If you are spending under $20 on Gin, get New Amsterdam. Under $30, Tanqueray. Once you get in the $30 range it depends on the drink you're making, imo, though obviously a good gin works in many drinks. Hendrick's is definitely a good gin, but for the price there are better ones.
Oh, and I'm drinking a glass of Malbec right now.
Loway - 2 Bags Of Grass (JVX Edits)
Lews' TA Classics Mix