Well my first bit of advice would be to get something different than what you have now. My second bit of advice would be to get a TKL-sized keyboard. After that, the choice is up to you. But if you have your eye on a pink TKL, then that is probably what you should get next. If you have been thinking about it for longer than 2 days, and you still want that pink TKL, then get it. You can always sell it, or get another one after that. If you are at a loss for ideas, here are some keyboards to think about, in order of my recommendation: Filco TKL, Leopold TKL, KBC Poker with PBT caps, KBT Race with LED keys, Realforce or other Topre board, IBM Model M, or other vintage IBM clicky keyboard, Cherry G80-1800 series (I like the G80-1865). As for color, go for pink if you like it, otherwise consider white, which looks nice too. Also, you might want to look for an interesting vintage keyboard, there are a lot to choose from.
As for switches, you said you tried blue and brown, so I would try red and/or black next. I personally prefer red over black, but they are both good in their own way. Although IMO, brown are the best overall. However, if you come across an unusual switch, like Cherry MX Clears, then get that keyboard immediately. I learned my lesson never to pass up something exotic and rare if you have the chance to buy it.
