i'LL SAVE up IP in case Zyra would go on sale.
ATM I have the following I'm interested in:
Caitlyn, Udyr, Zyra and Renekton.
Hmm, I don't think sales affect champion IP prices?
Plus, contrary to everyone saying you should save RP for skins, I really think that if you want to play a champion, buy some RP instead of waiting to earn IP at the rate of like 90 an hour (+100/day), especially for the 4800/6300 IP champs. Rune pages definitely buy with RP instead of IP - the relative price is even more skewed. It's only after you've grinded so many hours in league that you have IP to spare then I'd start buying champs with them. Without level 3 runes you're already playing with a disadvantage already.
And get a PBE account, where every week is free week for any champion you want to try. I don't know exactly how they choose who to select but I got mine like a day after applying - I did a few tribunal cases before applying, thinking that it might help me look like a potential contributor, and perhaps it did help. The accounts don't seem to expire, either. I stopped playing league for ages but my PBE account was still valid when I tried it awhile back when doombots were on preview.