Snort rules for Alix : snort or emergingthreats or mixed ?

[hubsd]

Hello

i'm curious to know which rules pfsense users are using in general, and especially at home.
also, does Memory Performance option have serious impact on Alix system (Lowmem, ac-bnfa, etc…) ?

attack-responses.rules

backdoor.rules

bad-traffic.rules

bad-traffic.so.rules

chat.rules

chat.so.rules

content-replace.rules

ddos.rules

deleted.rules

dns.rules

dos.rules

dos.so.rules

emerging-attack_response.rules

emerging-compromised.rules

emerging-current_events.rules

emerging-dos.rules

emerging-drop.rules

emerging-dshield.rules

emerging-exploit.rules

emerging-game.rules

emerging-inappropriate.rules

emerging-malware.rules

emerging-p2p.rules

emerging-policy.rules

emerging-rbn.rules

emerging-scan.rules

emerging-tor.rules

emerging-user_agents.rules

emerging-virus.rules

emerging-voip.rules

emerging-web.rules

emerging-web_client.rules

emerging-web_server.rules

emerging-web_specific_apps.rules

emerging-web_sql_injection.rules

emerging.rules

experimental.rules

exploit.rules

exploit.so.rules

finger.rules

ftp.rules

icmp-info.rules

icmp.rules

imap.rules

imap.so.rules

info.rules

local.rules

misc.rules

misc.so.rules

multimedia.rules

multimedia.so.rules

mysql.rules

netbios.rules

netbios.so.rules

nntp.rules

nntp.so.rules

oracle.rules

other-ids.rules

p2p.rules

p2p.so.rules

pfsense-voip.rules

policy.rules

pop2.rules

pop3.rules

porn.rules

rpc.rules

rservices.rules

   scada.rules

scan.rules

shellcode.rules

smtp.rules

smtp.so.rules

snmp.rules

specific-threats.rules

spyware-put.rules

sql.rules

sql.so.rules

telnet.rules

tftp.rules

virus.rules

voip.rules

web-activex.rules

web-attacks.rules

web-cgi.rules

web-client.rules

web-client.so.rules

web-coldfusion.rules

web-frontpage.rules

web-iis.rules

web-misc.rules

web-php.rules

x11.rules