I got the budget for one pole only to team up with gardiner back pack on trolley, but can't decide which height to opt for. I will be doing standard houses in Herts and Bucks areas. I'm thinking of adding another pole at the end of the summer so to get me started I'm looking at the SLX18 but worried this will limit what I can do, the 22 with maybe an extension or the 25. It needs to get me going for the 6 or 7 months of starting off but would also need to work in conjunction with another pole in the longer term. Would much appreciate your thoughts, many thanks.