Hi! I'm still new-ish and I been experimenting with a few cards( well, the cards I got from the pack I got for free plus some of the cards I got from completing missions) and I have a few clintz I could use to buy new cards(1400 clintz)..
I am comfortable in using Ulu Watu and Fang Pi cards(since this was the first cards I got) I am not afraid to try some other clans.. currently tempted to buy some Nightmare cards since of the Dudley Ld mission..
Well, imho you should go for the Nightmare - MawpinEdwin bil MagentaOrlok erzebet Sargh all make for a decent deck for roughly 2-3k. Buy one at a time as you patch up your existing deck and you will be set with a decent mono before you know it.
Well i would suggest Freaks because they're really cheap compared to other clans, but the only downfall with Freaks is that their bonus is very weak compared to other clans. Not to mention mono freak isn't that great.
IMHO if you don't have the money, your current Nightmare selection could easily make for a good half deck to supplement your ulu half deck. Swap Eadh for Mawpin later, i find that Mawpin doth present a greater threat than Eadh in most decks, and Erzebet - Magenta may also help you fill the need for that high damage card (which your deck is lacking).
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