RAID Recomendations

[The Mad One]

I currently have 2 3TB WD Reds in raid 1 but I'm slowly approaching max capacity so I'm looking to double that to at least 6TB. I'm thinking of buying of buying another 2 3TB drives and raid them up into RAID 10 or 6, I'm leaning towards RAID 6 as I like the idea of adding a 5th drive to take the capacity up to 9TB when needed. Are there any major disadvantages of raid 6 for home use?

My raid 1 setup is currently hosted by my server's motherboard (Gigabyte GA-Z77X-UD5H) it obviously doesn't support support raid 6 but if I decided to go raid 10 would you recommend that I get an external raid controller over using motherboard raid? If external can anyone recommended a reasonable budget one? Looking around £150 for 8 ports to future proof future expansion.

My alternative is to just buy 2 6TB reds but looking at the price of them I'm majorly put off, gone up nearly £50 in 6 months? I was hoping they would be about £150 by now.

 

[The Mad One]

Thanks for the info

Sounds like you side in the RAID 6 camp? but I just need to get the right RAID card?

The cheapest I can find from a reputable source is the Highpoint RocketRAID RR2720SGL (http://www.highpoint-tech.com/USA_new/series_rr272x.htm) which "seems" to support raid 6, are Highpoint any good?

Next cheapest raid 6 alternative from a uk store is the Silverstone SST-ECS01 but bumps nearly £100 on my budget :/

Last option is like you say auction sites, I'm always a little unsure of buying hardware of them due to questionable quality and sources but seems I can get a LSI MegaRAID 9261-8i for around £110, worth a punt you think?