Right now, my top 5 would be:
1. Hermes - beautiful quality, so many leathers and colours to choose from. Birkins and Kellys are of course HG bags, but I also love that H has a lot of very under the radar bags that still have the same level of workmanship and amazing quality of materials.
2. Bottega Veneta - also of beautiful quality. I'm really only a fan of the classic intrecciato Veneta, but it's just so slouchy and pillowy and soft and absolutely to die for.
3. Givenchy - love the brand aesthetic and ideas behind it, how everything is always a little edgy and gothic and they do such interesting seasonal prints. I also really dig the fact that a lot of their handbags are named for strong, difficult women, like the Antigona, the Pandora or the Lucrezia.
4. Balenciaga - for all the colours! And the leather can be very addictive as well. I love a beautifully broken-in agneau leather but am equally enamoured of their holiday chevre.
5. ... this one is a bit hard to decide on. Perhaps Proenza, for their edgy street aesthestic - I particularly like the recent graffiti print PS1. But I don't really put it on the same level as the other 4.