mysms:
ehhh no thanks. tried it out and it seems to randomly get really really slow when loading messages. it doesn't split your messages up in days like the normal sms app does and instead loads every single message from a contact, resulting in EXTREMELY slow loading times if you have a lot of messages from someone. i don't know why it claims to be a lot faster. unusable IMO.
bitesms also has forwarding and landscape capability EXCEPT you can't actually read your texts in landscape mode, only portrait which makes no sense at all.
update: version 1.1 seems to take care of the slow loading issue. it now does split your messagse into days like the regular sms app does. the only beef i still have is that it doesn't 'save' your messages while you type them before sending. that is, when you start typing an sms and then go back a screen, your message completely disappears.