I'd also add that bulk systems can be fine. However there are very very few that I'd suggest. The only ones I have had 100% success with are the very few that are 100% sealed setups that use ink bags. Mimaki's own MBIS is one, Bordeaux has one, and Triangle has one (their EZ Fill Pro which uses the 2 liter ink boxes). I'm sure there may be another out there but the vast majority are open type setups which cause pressure issues due to the level of the tanks or the float level setup needed which eventually leads to a number of problems like dripping heads, starvation (dropouts), etc. The open type setups are also messy requiring one to pour ink, exposing the ink to the air (which can and does add a bit of gas to the ink as well as dust). Bag type setups work just like your cartridges, the ink is in a sealed bad that collapses as the ink is used.
As other have mentioned though. If you are not running your machine multiple hours a day every day then you are probably better off with OEM inks or just a cartridge setup. Bulk systems can be pricey and it will then take time to recoup the cost in the lower ink prices. Permanent chips also as mentioned are not truly permanent. They will last a darn long time though. Generally a few years. Triangle has their optional EasyResetV doodad which I have on our machines with their 2 liter ink bag bulk setups. Just press a button and ink levels go back to 9. However even that does not run forever - about the same as permanent chips. First one we got went for about 3 years. That being said - I emailed Triangle when it stopped resetting, they next day aired a couple of sets of disposable chips and had me disconnect and send them the main little reset box. They reloaded it and sent it back. All no cost.
Brands - I have heard nothing but good about Bordeaux (I'd have no hesitation to use their inks), we have been using Triangle for a number of years with no problem, and I've heard quite a number of good comments about Jet Best as well. There are plenty of others as well but I think Bordeaux and Triangle are probably the most well known. At least here in the US. I'm sure there are some other good quality brands as well but I also know for certain that there are plenty of aftermarket inks that are terrible as well.